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Q12 (i) applying external angle property(sum of opposite interior angle is equal to external angle)
30+x=110
x=110-30
x=80
(ii)applying external angle property
60+y=120
y=60
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i) 30+x=110 ( opposite angles is equal to the exterior angle)
x=110-30
x=80
ii) 60+y=120
y=120-60
y=60
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