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In the figure AB is the diameter. PC is perpendicular to AB. PC = 6cm, PB = 3cm. Find the radius of the semi-circle.

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In the figure AB is the diameter. PC is perpendicular to AB. PC = 6cm, PB = 3cm. Find the radius of the semi-circle.

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AP × PB = PC2

AP × 3 = 62

AP = 36/3 = 12.

AB = 12 + 3 = 15 ie 

Radius = 15/2 = 7.5 cm

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