1.

In the given figure, ABCD is a parallelogram. If ∠B = 100°, then find the value of ∠A +∠C.

Answer»

The co-interior ANGLES are always 180° given angle B = 100

angle B + angle C = 180°

so ,180 - 100 = 80 ° angle C = 80°

The OPPOSITE angles of a PARALLELOGRAM are equal

i.e,

angle A = angle C = 80°

angle B = angle D = 100°

80° + 80° = 160°

Hence, the answer is 160°



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