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प्रश्न
A point A is 17cm from the centre of the circle. The length of the tangent drawn from A to the circle is 15cm. find the radius of the circle.
उत्तर
OA ⊥ AP (radius is perpendicular to tangent at the point of contact)
In right Δ OAP,
OP2 = OA2 + AP2
AP2 = 172 + 152
= 289 - 225
= 64
AP = 8
The radius of the circle is 8 cm.
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