Consider a triangle \( A B C \) with vertex \( A(2,-4) \). Then internal bisectors of the angles.... VIDEO
Consider a triangle \( A B C \) with vertex \( A(2,-4) \). Then internal bisectors of the angles \( B \) and \( C \) are \( x+y=2 \) and \( x-3 y=6 \)
\( \mathrm{P} \)
respectively. Let the two bisectors meet at \( I \).
W
If \( \left(x_{1}, y_{1}\right) \) and \( \left(x_{2}, y_{2}\right) \) are the co-ordinates of the point \( B \) and \( C \) respectively, then the value of \( \left(x_{1} x_{2}+y_{1} y_{2}\right) \) is equal to:
(1) 4
(2) 5
(3) 6
(4) 8
.
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