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15-09-2022
Mathematics

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ZA and ZB are supplementary angles. If mA = (2x − 9)º and m
ZB = (2x +21)°, then find the measure of ZA.

ZA and ZB are supplementary angles If mA 2x 9º and m ZB 2x 21 then find the measure of ZA class=

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15-09-2022

angle A = 30

(2x-9) = (2x+21)
+9 +9
2x=2x+30

-2x -2x

=30

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