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Question

If â–³PAB is right angle at P, where A(2,3) and B(5,7), then which of the following is/are correct?

A
Equation of circumcircle of PAB is x2+y27x10y+31=0
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B
Maximum possible area of PAB is 254 sq. units.
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C
When area of PAB is 6 sq. units, then there are 4 possible values of P.
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D
When area of PAB is 6 sq. units, then there are 2 possible values of P.
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Solution

The correct options are
A Equation of circumcircle of PAB is x2+y27x10y+31=0
B Maximum possible area of PAB is 254 sq. units.
C When area of PAB is 6 sq. units, then there are 4 possible values of P.
Assuming AB as a diameter of a circle, then P lies on the circle and PAB is right angle at P


Equation of circumcircle of PAB is
(x2)(x5)+(y3)(y7)=0x2+y27x10y+31=0

Length of AB
d=32+42=5r=52

Area of PAB
=12×PC×2r=PC×r
Maximum possible area occur when PC=r,
=r2=254sq. units

When area of PAB is 6 sq. units, then
6=PC×rPC=125<r
Therefore, there are 4 possible values of P as seen by the figure, two above and two below.

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