1.

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)rcan be equal to

Answer»

`R^(2)SIN^(2)A`
`R^(2)sin^(2)2B`
`(1)/(2)a^(2)`
`(a^(2))/(4)`

Answer :B::C


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