Question

Help plz with a cherry on top!

Answer 1

A triangle's angle measures add up to 180°.
67 + 90 = 157
180 - 157 = 23
The last angle measure is 23°.

The longer the side length, the larger the angle opposite it is. And vice versa. The shorter the side length, the smaller the angle opposite it is.

Side Length:     ∠ Measure Opposite Side:
5 in                      23°  
12 in                    67°
13 in                    90°