Question

Find the measure of the indicated angle in each triangle.

A)37

B)63

C)80

D)180

Answer 1

m<U be x

Apply angle sum property

`\\ \rm\rightarrowtail x+37+63=180`

`\\ \rm\rightarrowtail x+100=180`

`\\ \rm\rightarrowtail x=80`

Answer 2

m∠U = 80°

• total interior angle in a triangle is 180°

m∠U + 37° + 63° = 180°

m∠U = 180° - 63° - 37°

m∠U = 80°