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a) ang.A + ang.D =180° (sum of two adjacent angles is 180°)

hence, ang.D= 180°-x°

b)ang.A + ang.B =180° (sum of two adjacent angles is 180°)

hence, ang.B= 180°-x°

c) AD is not equal to BC bcoz in an isoceles trapezium the non parallel sides are same.

If you want to verify , measure the points D and B from the centre;they will not be equal.

Glad to help