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If triangle ABC is isosceles with AB = AC, and angle A = 40 degrees, what are th

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Question: If triangle ABC is isosceles with AB = AC, and angle A = 40 degrees, what are the measures of angles B and C?

Options:

  1. 70 degrees each
  2. 80 degrees each
  3. 60 degrees each
  4. 40 degrees each

Correct Answer: 80 degrees each

Solution: 

In an isosceles triangle, angles B and C are equal. Therefore, angle B + angle C = 180 - 40 = 140 degrees, so each is 70 degrees.

If triangle ABC is isosceles with AB = AC, and angle A = 40 degrees, what are th

Practice Questions

Q1
If triangle ABC is isosceles with AB = AC, and angle A = 40 degrees, what are the measures of angles B and C?
  1. 70 degrees each
  2. 80 degrees each
  3. 60 degrees each
  4. 40 degrees each

Questions & Step-by-Step Solutions

If triangle ABC is isosceles with AB = AC, and angle A = 40 degrees, what are the measures of angles B and C?
  • Isosceles Triangle Properties – In an isosceles triangle, two sides are equal, and the angles opposite those sides are also equal.
  • Triangle Sum Theorem – The sum of the interior angles of a triangle is always 180 degrees.
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