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Q.

A(−5,0) and B(3,0) are two of the vertices of a triangle ABC. Its area is 20 square ems. The vertex C lies on the line x−y=2. The coordinates of C, are

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a

(−7,−5) or (3,5)

b

(−3,−5) or  (−5,7)

c

(7,5)or (3,5)

d

(−3,−5)or (7,5)

answer is D.

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Detailed Solution

Let the coordinates of the third vertex C be (h, k). Then, Area of ABC = 20 sq. units ⇒ 12h    k    1−5    0    13    0    1=±20⇒k=±5.             …(i)Since, (h, k) lies on x-y=2 Therefore, h−k=2                                                        …(ii)Solving (i) and (ii), we find that the coordinates of the third vertex are (-3,-5) or,(7, 5).
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