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Question

A square has side 4 cm. Another square is obtained by doubling the sides of the first square. What is the ratio between the areas of the first and the second square?


A
1:2
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B
1:4
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C
3:4
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D
3:8
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Solution

The correct option is B 1:4
Area of first square
=4 cm×4 cm=16 cm2

Side of second square
=2 ×4 cm=8 cm

Area of second square
=8 cm×8 cm=64 cm2

The ratio =16:64=1:4

Mathematics

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