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Question

ABCD is a rectangle. If the diagonals AC and BD intersect at O and OC = 3 cm, find BD.

A
3 cm
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B
4 cm
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C
5 cm
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D
6 cm
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Solution

The correct option is D 6 cm

Given, ABCD is a rectangle and OC = 3cm.
The diagonals of a rectangle bisect each other.

So, if AC is a diagonal, intersecting BD at O, AO = OC = 3 cm.
AC = AO + OC = 3 cm + 3 cm = 6 cm.

In a rectangle, diagonals are equal.
So, AC = BD.
Since, AC = 6 cm
BD = 6 cm.

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