Question

In the adjoining diagram lines AB and CD intersect at O.If angle 1 + angle 3 =78degree find the size of angle 2

Answer 1

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Answer 2

angle 1+angle 3=78°. 1
angle 2+angle 3=180°. 2
subtracting eq 2 from 1
angle 2-angle 1=102°
angle 2+angle1=180
2 angle 2=282
angle 2=141°
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