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21. A(1, 2) and B(7, 10) are two points. If P(x, y) is a pointsuch that the angle APB is 60^° and the area of thetriangle APB is maximum, then which of the followingis/are true?(a) P lies on any line perpendicular to AB(b) P lies on the right bisector of AB.(c) P lies on the straight line 3x +4y 36.(d) P lies on the circle passing through the points (1, 2)and (7, 10) and having a radius of 10 units.

Answer» 21. A(1, 2) and B(7, 10) are two points. If P(x, y) is a pointsuch that the angle APB is 60^° and the area of thetriangle APB is maximum, then which of the followingis/are true?(a) P lies on any line perpendicular to AB(b) P lies on the right bisector of AB.(c) P lies on the straight line 3x +4y 36.(d) P lies on the circle passing through the points (1, 2)and (7, 10) and having a radius of 10 units.


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