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Vertically opposite angles are always

Vertically Opposite angles are formed when two lines intersect at a point. This angles are always equal.

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30

In Fig. 5.25, lines PQ and ST intersect at O. If ∠POR = 90° and x : y = 3 : 2, then z is equal to

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In Fig. 5.26, POQ is a line, then a is equal to

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In Fig. 5.27, a = 40°. The value of b is

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If an angle is 60° less than two times of its supplement, then the greater angle is