Question

Consider triangle PQR shown in the coordinate plane.

If Sheila rotates triangle PQR 90° counterclockwise to form triangle LMN, what is the measure of ∠MLN?

Answer 1

30


The lettering goes clockwise. MNL is the same thing as QRP. So what is R?

50 + 100 + R = 180

150 + R = 180

R = 180 - 150

R = 30