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In Fig. 10.88, A P B is a tangent ...

In Fig. 10.88, `A P B` is a tangent to a circle with centre `O` at point `P` . If `/_Q P B=50o` , then the measure of `/_P O Q` is (FIGURE) `100o` (b) `120o` (c) `140o` (d) `150o`

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