abcd is a parallelogram. find measure of <dab
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Answer Given : <ABC = 110°
To prove : < DAB ,<ADC
Proof : < ADC = <ABC = 110°( opp. Angles are equal)
<DAB = < ACD ( Opp. Angles are equal)
Let < DAB and < ACD be x
By angle sum theorem
< DAB + <ABC + < ACD + < ADC = 360°
X °+ 110°+x°+110°= 360°
2x = 360°-220°= 140°
X= 140/2= 70°
Therefore < DAB = 70°
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