Q. If a triangle has sides of lengths 5 cm, 12 cm, and 13 cm, what type of triangle is it?
A.
Acute
B.
Obtuse
C.
Right
D.
Equilateral
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Solution
This triangle satisfies the Pythagorean theorem (5² + 12² = 13²), thus it is a right triangle.
Correct Answer:
C
— Right
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Q. If the area of a triangle is 24 cm² and the base is 8 cm, what is the height?
A.
6 cm
B.
8 cm
C.
12 cm
D.
3 cm
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Solution
Area = 1/2 * base * height. Therefore, 24 = 1/2 * 8 * height, which gives height = 6 cm.
Correct Answer:
A
— 6 cm
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Q. If the area of a triangle is 24 square cm and the base is 8 cm, what is the height?
A.
3 cm
B.
6 cm
C.
8 cm
D.
12 cm
Show solution
Solution
The area of a triangle is given by the formula Area = 1/2 * base * height. Thus, 24 = 1/2 * 8 * height, which gives height = 6 cm.
Correct Answer:
B
— 6 cm
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Q. If the area of a triangle is given by the formula A = 1/2 * base * height, what is the area of a triangle with a base of 10 cm and a height of 5 cm?
A.
25 cm²
B.
50 cm²
C.
15 cm²
D.
30 cm²
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Solution
Substituting the values into the area formula: A = 1/2 * 10 * 5 = 25 cm².
Correct Answer:
A
— 25 cm²
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Q. If the lengths of the sides of a triangle are in the ratio 3:4:5, what type of triangle is it?
A.
Equilateral
B.
Isosceles
C.
Scalene
D.
Right
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Solution
A triangle with sides in the ratio 3:4:5 satisfies the Pythagorean theorem, thus it is a right triangle.
Correct Answer:
D
— Right
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Q. If the perimeter of an equilateral triangle is 36 cm, what is the length of each side?
A.
9 cm
B.
12 cm
C.
15 cm
D.
18 cm
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Solution
In an equilateral triangle, all sides are equal. Therefore, if the perimeter is 36 cm, each side is 36/3 = 12 cm.
Correct Answer:
B
— 12 cm
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Q. If the perimeter of an isosceles triangle is 24 cm and the length of the base is 8 cm, what is the length of each of the equal sides?
A.
8 cm
B.
10 cm
C.
12 cm
D.
6 cm
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Solution
Let the length of each equal side be x. The perimeter is given by 2x + 8 = 24. Solving for x gives 2x = 16, so x = 8 cm.
Correct Answer:
B
— 10 cm
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Q. If the perimeter of an isosceles triangle is 24 cm and the lengths of the two equal sides are 10 cm each, what is the length of the base?
A.
4 cm
B.
6 cm
C.
8 cm
D.
10 cm
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Solution
The perimeter is the sum of all sides. Therefore, base = 24 - (10 + 10) = 4 cm.
Correct Answer:
B
— 6 cm
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Q. If the sides of a triangle are in the ratio 3:4:5, which type of triangle is it?
A.
Equilateral
B.
Isosceles
C.
Scalene
D.
Right-angled
Show solution
Solution
A triangle with sides in the ratio 3:4:5 is a right-angled triangle, as it satisfies the Pythagorean theorem.
Correct Answer:
D
— Right-angled
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Q. In a triangle, if one angle measures 45 degrees and the other measures 45 degrees, what type of triangle is it?
A.
Scalene
B.
Isosceles
C.
Equilateral
D.
Right
Show solution
Solution
A triangle with two equal angles is an isosceles triangle.
Correct Answer:
B
— Isosceles
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Q. In a triangle, if the lengths of two sides are 7 cm and 10 cm, what is the range of possible lengths for the third side?
A.
3 cm to 17 cm
B.
3 cm to 10 cm
C.
10 cm to 17 cm
D.
7 cm to 10 cm
Show solution
Solution
According to the triangle inequality theorem, the length of the third side must be less than the sum of the other two sides and greater than the difference of the two sides. Therefore, the range is 3 cm to 17 cm.
Correct Answer:
A
— 3 cm to 17 cm
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Q. In a triangle, if the lengths of two sides are 7 cm and 10 cm, which of the following could be the length of the third side?
A.
3 cm
B.
15 cm
C.
5 cm
D.
17 cm
Show solution
Solution
According to the triangle inequality theorem, the length of the third side must be less than the sum and greater than the difference of the other two sides. Therefore, the third side must be greater than 3 cm and less than 17 cm.
Correct Answer:
A
— 3 cm
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Q. In triangle ABC, if angle A is 30 degrees and angle B is 60 degrees, what is the measure of angle C?
A.
30 degrees
B.
60 degrees
C.
90 degrees
D.
120 degrees
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Solution
Using the property that the sum of angles in a triangle is 180 degrees, angle C can be calculated as 180 - (30 + 60) = 90 degrees.
Correct Answer:
C
— 90 degrees
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Q. In triangle DEF, if angle D is 45 degrees and angle E is 45 degrees, what is the type of triangle?
A.
Scalene
B.
Isosceles
C.
Equilateral
D.
Right
Show solution
Solution
Since two angles are equal (45 degrees), triangle DEF is an isosceles triangle.
Correct Answer:
B
— Isosceles
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Q. In triangle DEF, if angle D is 45 degrees and angle E is 45 degrees, what type of triangle is DEF?
A.
Scalene
B.
Isosceles
C.
Equilateral
D.
Right-angled
Show solution
Solution
Since two angles are equal (45 degrees each), triangle DEF is an isosceles triangle.
Correct Answer:
B
— Isosceles
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Q. In triangle DEF, if angle D is 90 degrees and the lengths of the legs are 6 cm and 8 cm, what is the length of the hypotenuse?
A.
10 cm
B.
12 cm
C.
14 cm
D.
16 cm
Show solution
Solution
Using the Pythagorean theorem, hypotenuse = √(6² + 8²) = √(36 + 64) = √100 = 10 cm.
Correct Answer:
A
— 10 cm
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Q. In triangle XYZ, if side XY = 8 cm, side YZ = 6 cm, and side XZ = 10 cm, which of the following is true?
A.
It is a right triangle.
B.
It is an obtuse triangle.
C.
It is an acute triangle.
D.
It cannot be classified.
Show solution
Solution
Using the Pythagorean theorem, since 10^2 = 8^2 + 6^2 (100 = 64 + 36), triangle XYZ is a right triangle.
Correct Answer:
A
— It is a right triangle.
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Q. In triangle XYZ, if side XY is 8 cm, side YZ is 6 cm, and angle X is 45 degrees, which method can be used to find the length of side XZ?
A.
Pythagorean theorem
B.
Sine rule
C.
Cosine rule
D.
Area formula
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Solution
To find the length of side XZ when two sides and the included angle are known, the Cosine rule is applicable.
Correct Answer:
C
— Cosine rule
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Q. In triangle XYZ, if side XY is 8 cm, side YZ is 6 cm, and side XZ is 10 cm, which of the following is true?
A.
It is a right triangle.
B.
It is an isosceles triangle.
C.
It is an equilateral triangle.
D.
It is a scalene triangle.
Show solution
Solution
Since all sides are of different lengths, triangle XYZ is a scalene triangle.
Correct Answer:
D
— It is a scalene triangle.
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Q. In triangle XYZ, if XY = 5 cm, YZ = 12 cm, and XZ = 13 cm, what type of triangle is it?
A.
Acute
B.
Obtuse
C.
Right
D.
Equilateral
Show solution
Solution
Using the Pythagorean theorem, since 5^2 + 12^2 = 25 + 144 = 169 = 13^2, triangle XYZ is a right triangle.
Correct Answer:
C
— Right
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Q. In triangle XYZ, if XY = 8 cm, YZ = 6 cm, and XZ = 10 cm, which of the following is true?
A.
It is an equilateral triangle.
B.
It is an isosceles triangle.
C.
It is a scalene triangle.
D.
It is a right triangle.
Show solution
Solution
Since all sides are of different lengths, triangle XYZ is a scalene triangle.
Correct Answer:
C
— It is a scalene triangle.
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Q. In triangle XYZ, if XY = 8 cm, YZ = 6 cm, and XZ = 10 cm, which side is the longest?
A.
XY
B.
YZ
C.
XZ
D.
All sides are equal
Show solution
Solution
The longest side in triangle XYZ is XZ, which measures 10 cm.
Correct Answer:
C
— XZ
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Q. What is the area of a triangle with a base of 10 cm and a height of 5 cm?
A.
25 cm²
B.
50 cm²
C.
15 cm²
D.
30 cm²
Show solution
Solution
The area of a triangle is given by the formula (1/2) * base * height. Thus, Area = (1/2) * 10 * 5 = 25 cm².
Correct Answer:
A
— 25 cm²
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Q. Which of the following can be the lengths of the sides of a triangle?
A.
2, 3, 5
B.
4, 4, 8
C.
5, 5, 10
D.
6, 8, 10
Show solution
Solution
The triangle inequality theorem states that the sum of the lengths of any two sides must be greater than the length of the third side. Only 6, 8, and 10 satisfy this condition.
Correct Answer:
D
— 6, 8, 10
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Q. Which of the following is a property of an isosceles triangle?
A.
All sides are equal.
B.
Two sides are equal.
C.
It has one right angle.
D.
It has no equal sides.
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Solution
An isosceles triangle is defined as having at least two sides that are equal in length.
Correct Answer:
B
— Two sides are equal.
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Q. Which of the following is a property of similar triangles?
A.
Their corresponding angles are equal.
B.
Their corresponding sides are equal.
C.
They have the same area.
D.
They are congruent.
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Solution
Similar triangles have equal corresponding angles, but their sides are in proportion, not necessarily equal.
Correct Answer:
A
— Their corresponding angles are equal.
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Q. Which of the following is NOT a property of an isosceles triangle?
A.
It has two equal sides.
B.
The angles opposite the equal sides are equal.
C.
The area can be calculated using base and height.
D.
All angles are equal.
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Solution
An isosceles triangle has two equal sides and the angles opposite those sides are equal, but it does not have all angles equal unless it is also equilateral.
Correct Answer:
D
— All angles are equal.
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Q. Which of the following is NOT a property of triangles?
A.
The longest side is opposite the largest angle.
B.
The shortest side is opposite the smallest angle.
C.
The area can be calculated using base and height.
D.
All angles must be acute.
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Solution
Not all triangles have all angles acute; for example, a right triangle has one angle that is 90 degrees.
Correct Answer:
D
— All angles must be acute.
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Q. Which of the following is NOT a type of triangle based on side lengths?
A.
Equilateral
B.
Isosceles
C.
Scalene
D.
Quadrilateral
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Solution
A quadrilateral is a four-sided figure and not a type of triangle.
Correct Answer:
D
— Quadrilateral
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Q. Which of the following statements about an equilateral triangle is true?
A.
All sides are equal
B.
All angles are 60 degrees
C.
It has one obtuse angle
D.
It can be isosceles
Show solution
Solution
In an equilateral triangle, all sides are equal and all angles measure 60 degrees.
Correct Answer:
A
— All sides are equal
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