Question

Use the picture to answer the question. Angle ABC is rotated 50° around point D . What is the measure of angle A'B'C' ?

A. 90°


B. 130°


C. 40°


D. 50°

Answer 1

Answer: A. 90°

Explanation:

From the given picture, we can see that the measure of ∠ABC=90°.

Given that Angle ABC is rotated 50° around point D .

We know that a rotation is a rigid transformation that produces an image of a geometric figure with same shape and size by rotating about the the center of rotation.

It preserves the shape and angle inside the figure.

Therefore, ∠A'B'C'=∠ABC=90°.

Answer 2

A. 90

Explanation:

Rotating an angle does not change its measure. ABC is 90 degrees as marked by the corner symbol. After rotating, the angle stays 90 degrees.