Question

Length of tangent drawn from a point 7cm from centre of circle of radius 4cm

Answer 1

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Answer 2

Answer:

AB=√33

Step-by-step explanation:

Let centre of circle be O, Point from centre be A and Point of contact be B.

In ΔAOB, ∠B=90° (radius⊥tangent at point of contact)

∴AB²+OB²=AO²

AB²=7²-4²

AB²=49-16

∴ AB=√33