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Question

In parallelogram ABCD, A(2,3), B(6,5) and D(4,7). Then the coordinates of C is


A

(4,2)

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B

(8,9)

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C

(8,7)

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D

(4,9)

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Solution

The correct option is B

(8,9)


Draw AE, DF parallel to x-axis.

Draw BE, CF parallel to y-axis.

Now, in right triangles ABE and DCF,

AB = DC

BAE=CDF

ABE=DCF

Therefore, AE = DF and BE = CF

Hence,
AE = DF = 6 -2 = 4 and BE = CF = 5 - 3 = 2

Now,
x-coordinate of C = 4 + DF = 4 + 4 = 8
y-coordinate of C = 7 + CF = 7 + 2 = 9

Therefore coordinates of C(8,9)


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