1.

Let ABC be a triangle with incentre at I. Also, let P and Q be the feet of perpendiculars from A to BI and CI, respectively. Then which of the following result are correct?

Answer»

`(AP)/(BI)=("SIN"(B)/(2)"COS"(C)/(2))/("sin"(A)/(2))`
`(AQ)/(CI)=("sin"(C)/(2)"cos"(B)/(2))/("sin"(A)/(2))`
`(AP)/(BI)=("sin"(C)/(2)"cos"(B)/(2))/("sin"(A)/(2))`
`(AP)/(BI)+(AQ)/(CI)= SQRT(3) " if "angleA=60^(@)`

ANSWER :A::B::D


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