Question

If A(1, 3), B( 1, , -1), C( 7, -1) are three vertices of a rectangle ABCD, What is the coordinates of vertex D? 


( 3, 3)

( -7, - 3)

( 3, -7)

( 7, 3 )​

Answer 1

From the graph,

The coordinates of point D are (3,3).

Area of rectangle ABCD=l×b=AB×BC

On further calculation we get

Area of rectangle ABCD=6×2

Area of rectangle ABCD=12 sq. units

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