Question

prove that the lengths of tangents drawn from and external point to a circle are equal

Answer 1

Hope it helps
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Answer 2

Answer:

To prove PT=QT

Proof: Consider the triangle OPT and OQT.

OP=OQ

∠OPT=∠OQT=90∘

OT=OT (common side)

Hence by RHS the triangles are equal.

Hence PT=QT

Hence Proved.  

For Diagram  :http://clay6.com/mpaimg/24d.jpg