Question

Congruency and similarity

Answer 1

A triangle is 180°, so the 3 angles should add up to 180°.

To find m∠R, you can do this:

m∠S + m∠R + m∠T = 180°

56° + m∠R + 30° = 180°      

m∠R + 86° = 180°   Subtract 56 and 30 on both sides

m∠R = 94°