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Question

Three vertices of a parallelogram are (a+b,ab),(2a+b,2ab)and (ab,a+b) taken in a order, the fourth vertex is (b,b)
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Solution

Let D be the fourth vertex.

D(x,y)

Given, C(ab,a+b)

Let P be the mid point of A(a+b,ab),B(2a+b,2ab)

coordinate of mid point of AC=coordinate of mid point of BD

(a+b+ab2,ab+a+b2)=(2a+b+x2,2ab+y2)

(a,a)=(2a+b+x2,2ab+y2)

by solving the above equation, we get

2a+b+x2=ax=b

2ab+y2=ay=b

D(x,y)=D(b,b) the fourth vertex.


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