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Let ABC be an isosceles triangle with ba...

Let ABC be an isosceles triangle with base BC. If 'r' is the radius of the circle inscribed in triangle ABC and `r_(1)` is the radius of the circle escribed opposite to the angle A, then the product `r_(1)r` can be equal to

A

`R^(2) sin^(2)A`

B

`R^(2) sin^(2)2B`

C

`1/2 a^(2) `

D

`a^(2)/4`

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The correct Answer is:
D
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