# Locate the points A(1,2), B(3,4) and C(5,2) on a graph sheet taking suitable axes. Write the coordinates of the fourth point D to complete the rhombus ABCD. Measure the diagonals of this rhombus and find whether they are equal or not.

The points on the graph are

A = (1, 2)

B = (3, 4)

C = (5, 2) The incomplete rhombus on the graph will look like The completed rhombus ABCD on the graph is The coordinates of point D to complete the rhombus ABCD are D (3, 0).

The diagonal AC has the y-coordinate constant, i.e. 2.

The length of AC = difference in x-coordinates = 5 – 1 = 4 units

The diagonal BD has the x-coordinate constant, i.e. 3.

The length of BD = difference in y-coordinates = 4 – 0 = 4 units

The two diagonals of rhombus ABCD are equal in length.

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