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Step-by-step explanation:
4y+2+5y-20 = 180°----- angles in linear pair
9y-18=180
9y=180+18
9y=198
y=198÷9
y=22
- substitute the values of y
4y+2 = 4(22)+2
=88+2=90
=90°
5y-20 = 5(22)-20=110-20=90°
=90°
similarly we can prove that other angles are 90°
therefore
POR = ROQ =QOS =POS = 90°
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