III. Evaluation:1. The meeting point of theof a triangle is called Incentre2. The Incentre of a triangle is denoted by the letter3. Is it possible to divide an angle into two equal parts without the protractor4. Where does the Incentre of a triangle lies always?5. How does the perpendicular bisectors drawn from the incentre to the side of a trianglelies?
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Answer:
IA=
sin(
2
A
)
r
,IB=
sin(
2
B
)
r
,IC=
sin(
2
C
)
r
IA:IB:IC=
sin(
2
A
)
r
:
sin(
2
B
)
r
:
sin(
2
C
)
r
IA:IB:IC=cosec(
2
A
):cosec(
2
A
):cosec(
2
A
)
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