A tangent PQ at a point p of a circle of radius 5cm meets a line through the centre O at a point Q so that OQ=12cm. find the length of PQ
panditavani123:
use pythagoras theorem
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triangle OPQ is a right triangle since tangent is perpendicular to radius.
OQ²=OP²+PQ²
12²=5²+PQ²
144-25=PQ²
PQ²=119
PQ=√119 cm
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