Prove that in parallelogram, the sum of opposite angles are 180 degrees.
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Let ABCD a parallegram
AB║CD
hence
∠B+∠C=180.....(i)
Slly BC║AD
∠B+∠A=180......(ii)
Thus from (i) and (ii)
∠A=∠C
Similarly ∠B=∠D
AB║CD
hence
∠B+∠C=180.....(i)
Slly BC║AD
∠B+∠A=180......(ii)
Thus from (i) and (ii)
∠A=∠C
Similarly ∠B=∠D
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