The inscribed angle is half the measure of the central angle that subtends the same arc. Therefore, the inscribed angle measures 80/2 = 40 degrees.

The angles subtended by the same chord at the circumference are equal.

A radius that is perpendicular to a chord at its endpoint bisects the chord.

The angle subtended at the circumference is half the angle subtended at the center. Therefore, it is 80/2 = 40 degrees.

The angle subtended at the circumference is half the angle subtended at the center. Therefore, the angle at the circumference is 80/2 = 40 degrees.

The angle subtended at the circumference is half of that at the center, so it is 30 degrees.

The angle subtended at the circumference is half of that at the center, so it is 30 degrees.

The angle in radians is given by the formula θ = s/r, where s is the arc length. Thus, θ = 10/5 = 2 rad.

If the radius is doubled, the area increases by a factor of four (since area is proportional to the square of the radius).

If the radius increases by 50%, the new radius is 1.5r. The area becomes π(1.5r)² = 2.25πr², which is an increase of 125%.

If the radius increases by 50%, the new radius is 1.5r. The area becomes π(1.5r)² = 2.25πr², which is an increase of 125%.

Reflecting a point across the x-axis changes the sign of the y-coordinate. Thus, A(2, 3) becomes (2, -3).

Reflecting a point (x, y) over the x-axis results in (x, -y). Therefore, A(2, 3) becomes (2, -3).

In a cyclic quadrilateral, opposite angles are supplementary. Therefore, if one angle is 80 degrees, the opposite angle can be 100 degrees.

In a cyclic quadrilateral, the opposite angles are supplementary, meaning they add up to 180 degrees.

In a cyclic quadrilateral, the opposite angles are supplementary, meaning they add up to 180 degrees.

In a cyclic quadrilateral, the opposite angles are supplementary, meaning they add up to 180 degrees.

In a cyclic quadrilateral, the opposite angles are supplementary, meaning they add up to 180 degrees.

In a cyclic quadrilateral, the sum of opposite angles is always 180 degrees.

In a cyclic quadrilateral, the opposite angles are supplementary, meaning they add up to 180 degrees.

In a parallelogram, opposite angles are equal, so the opposite angle also measures 60 degrees.

Area of a parallelogram = base * height = 12 * 5 = 60 cm².

In a parallelogram, the diagonals bisect each other, which is a defining property of parallelograms.

In a parallelogram, while opposite angles are equal and diagonals bisect each other, all sides being equal is a property of a rhombus, not all parallelograms.

The formula for the sum of the interior angles of a polygon is (n-2) * 180, where n is the number of sides. Setting (n-2) * 180 = 720 gives n = 6.

If both pairs of opposite sides are equal, then ABCD is a parallelogram.

The sum of the angles in any quadrilateral is 360 degrees. Given angles A and B, we can find C + D = 360 - (70 + 110) = 180 degrees.

The sum of the angles in a quadrilateral is 360 degrees. Therefore, angles C and D must sum to 180 degrees, making them supplementary.

In a quadrilateral, the sum of the angles is 360 degrees. Given angle A (90) and angle B (45), angle C + angle D = 360 - (90 + 45) = 225 degrees. The only option that fits is angle C = 135 degrees and angle D = 135 degrees.

The sum of the interior angles of any quadrilateral is always 360 degrees, which means ABCD can be any shape that satisfies this condition.