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Question

A rectangle has one of its diagonals equal to 5 cm. If the breadth of the rectangle is 3 cm, then its area is

A
12 cm2
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B
18 cm2
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C
20 cm2
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Solution

The correct option is A 12 cm2

Using pythagoras theorem,
CD=(AC)2(DA)2
CD=259 = 16 = 4 cm

Area of rectangle ABCD = length × breadth
Area=4×3 = 12 cm2

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