Question

Sam rotated parallelogram ABCD 90° clockwise around the origin. If angle A is 130° and angle B is 50°, what is the degree measurement of angle A'?

Answer 1

The degree measurement of angle A is already equal to 50 degrees.

Answer 2

The degree measurement of angle A' is 130°.

Explanation:

Given information: ∠A = 130° and ∠B = 50°.

Sam rotated parallelogram ABCD 90° clockwise around the origin. If angle A is 130° and angle B is 50°.

Rotation is a rigid transformation, it means the size and shape of a figure remains same after rotation. In other words we can say that preimage and image are congruent.

`ABCD\cong A'B'C'D'`

Corresponding parts of congruent figures are congruent.

`\angle A\cong \angle A'`

`m\angle A=m\angle A'`

`130^(\circ)=m\angle A'`

Therefore the degree measurement of angle A' is 130°.