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Grade: 11


A (5,3), B (3,-2) are two fixed points, find the equation to the locus of a point P which moves so that the area of the triangle PAB is 9 units.

9 years ago

Answers : (2)

vikas askiitian expert
509 Points

let p be any point (X,Y) then

AB(vector) = -2i - 5j

AP(vector) = (X-5)i + (Y-3)j

area of triangle = (AB*AP)/2                                    (* is cross product)

                    +or-9  = (-2(Y-3) + 5(X-5)) /2

    solve this and get ur ans

9 years ago
Fawz Naim
37 Points

Let the point of which we have to find the locus is C(a,b). Now the other two points are A(5,3),B(3,-2).The area of the triangle formed by these points is given by the formula

1/2 modulus(x1(y2-y3)+x2(y3-y1)+x3(y1-y2)). This area is equal to 9 sq.units

We know the values of x1,x2,x3,y1,y2,y3. Put the values and make an equation in terms of a and b. At the end put x and y at the place of a and b. This is the equation of the locus of point C.

9 years ago
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