Question

prove that the tangents draw from an external point to the circle are equal​

Answer 1

Answer:

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Answer 2

Given : A circle with centre O; PA and PB are two tangents to the circle drawn from an external point P

To prove: PA = PB

Construction: Join OA, OB, and OP

It is known that a tangent at any point of a circle is perpendicular to the radius through the point of contact

OA⊥PA

OB⊥PB

In △OPA and △OPB

∠OPA=∠OPB (Using (1))

OA=OB (Radii of the same circle)

OP=OP (Common side)

Therefor △OPA≅△OPB (RHS congruency criterion)

PA=PB

(Corresponding parts of congruent triangles are equal)

Thus, it is proved that the lengths of the two tangents drawn from an external point to a circle are equal.

The length of tangents drawn from any external point are equal.

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