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If the chord of contact of tangents draw...

If the chord of contact of tangents drawn from the (h, k) to the circle `x^2+y^2=a^2` subtends a right at the centre, then:

A

`h^2+k^2=a^2`

B

`h^2-k^2=a^2`

C

`2(h^2+k^2)=a^2`

D

`h^2+k^2=2a^2`

Text Solution

Verified by Experts

The correct Answer is:
D
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