In the adjoining figure, WXYZ is a parallelogram. The values of a and b is:

a = 15 and b = 4

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a = 16 and b = 10

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a = 9 and b = 9

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a = 12 and b = 8

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Solution

The correct option is A
a = 15 and b = 4

7b= 28° and 5a=75° [If a transversal intersect two parallel lines, the alternate interior angles are equal in measure.]

a = 15 and b = 4

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In the adjoining figure, ABCD is a parallelogram in which $∠ A = 72^{\circ}$ . Calculate $∠ B, ∠ C a n d ∠ D$ .

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