Question

A. 60
B. 180
C. 110
D. 70
Please give an explanation)):

Answer 1

triangle ACB must add up to 180 degrees so, you will add 30 + 80. (110) and subtract it from 180. therefore the measure of B = 70 degrees.

Answer 2

Explanation:

Since the angles of a triangle have to add up to 180 we can solve for angle b by adding the other two angles and subtracting them from 180

Solution

30+80+b=180

b=70