Question

A right triangle with coordinates A (-2,5), B (-2, 9) and C (4,5) is first rotated 90 degrees counterclockwise and

then translated 2 units left and 3 units down to form triangle A'B'C'. What is the measure of angle B'A'C',
in degrees, in the resulting figure?

Answer 1

90 degree

Explanation:

since the original angle BAC is 90 degree, no matter the triangle is rotated or translated, the angle remain unchanged