Question

figure a is reflected across line l to create figure b. the measure of angle a is 70°. what is the measure of angle b? enter the answer in the box. °

Explanation:

Step1: Recall reflection property

Reflection is a rigid transformation. Rigid transformations (like reflection) preserve the shape and size of the figure. This means corresponding angles of the pre - image (Figure A) and the image (Figure B) are congruent.

Step2: Find the measure of angle B

Since angle A and angle B are corresponding angles (because Figure B is the reflection of Figure A across line \(l\)), and \(m\angle A = 70^{\circ}\), then \(m\angle B=m\angle A\).

Answer:

\(70\)