Q39 of 158 Page 159

In Fig. 6.16, if AB ∥ CD, then

Exterior angle is equal to the sum of opposite interior angles


Then;


In Δ ABC


As BC is extended


∠A + ∠B = ∠3 + ∠4


∴ ∠1 + ∠2 = ∠3 + ∠4

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