Question

Find the measure of the indicated angle in each triangle.

A)37

B)63

C)80

D)180

Answer 1

m∠U = 80°

• total interior angle in a triangle is 180°

m∠U + 37° + 63° = 180°

m∠U = 180° -  63° - 37°

m∠U = 80°

Answer 2

m<U be x

Apply angle sum property

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

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

$\\ \rm\rightarrowtail x=80$