1.

Consider a triangle PQR with coordinates of its vertices as P(-8,5), Q(-15, -19), and R (1, -7). The bisector of the interior angle of P has the equation which can be written in the form ax+2y+c=0. The radius of the in circle of triangle PQR is The sum a + c is

Answer»

129
78
89
none of these

Solution :The COORDINATES of D using section formula are (-5, -23/2) and
`m_(PD) = -11//2.` The EQUATION of PD is
11x+2y+78=0
or a+c = 89


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