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2015-10-30T13:59:16+05:30

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If ABCD is IIgm having angle b as 100 degree then angle A will be 80 degree as in a IIgm adjacent angles are supplementry.Angle C will be 80 degree too as angle A and Angle C are opposite angles which are equal in a IIgm. Hope it helps and pls mark as the best answer. :)
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2015-10-30T14:12:04+05:30

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
if ABCD is a parallelogram the,
∠B = 100°
∴ ∠D = 100° 
and,
∠A = ∠C = ∠x ( we have let ∠A and ∠C as ∠x )
since opposite angles of a parallelogram is equal. 
and,
∠A +∠B + ∠C +∠D = 360°
since angle sum property of a parallelogram is 360°
∠x + ∠x + 100° + 100° = 360°
2∠x + 200° = 360°
2∠x = 360° - 200°
2∠x = 160°
∠x = 160/2
∠x = 80°
therefore ∠A = 80° and ∠C = 80°
   i hope that this will help u.............................^_^
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