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If I(1) is the centre of the escribed ci...

If `I_(1)` is the centre of the escribed circle touching side BC of `DeltaABC` in which `angleA=60^(@)`, then `I_(1)` A =

A

`r_(1)`

B

`(r_(1))/2`

C

`2r_(1)`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
C
We have,
`I_(1)A=r_(1)cosecA/2=r_(1)cosec30^(@)=2r_(1)`
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