Given:

Question

ABC is located on the coordinate plane

A measures 78o

If the triangle is rotated 45o clockwise about the origin to form
A'B'C', what is the measure of
A' ?
39o
45o
78o
102o

Answer 1

To find the measure of angle A' after rotating triangle ABC 45 degrees clockwise about the origin, we start with angle A, which measures 78 degrees.

When we rotate a triangle, the angles themselves do not change; only their positions in the coordinate plane are altered. Therefore, the measure of angle A' will remain the same as that of angle A.

Thus, angle A' also measures 78 degrees.

So, the correct answer is: 78o