Question

ZA and B are supplementary angles. If m_A = (x – 18)° and m

ZB = (x – 20°, then find the measure of ZB.

Answer 1

Explanation:

x-18+x-20=180(being supplementary angle)

or,2x-38=180

or,2x=180+38

or,2x=218

or,x=218/2

x=109

now,

ZB=x-20

=109-20

=89