The length of a side of a square is $10 c m$ . What is its area in square metre?

7.6 m

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7.9 m

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8.0 m

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9.9 m

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Solution

The correct option is B
7.9 m

Given,

Length of the side $(a)$ = $10 c m$

Area of square = $a^{2}$ = $(10 c m)^{2}$

We know $1 m = 100 c m$ or $1 c m = 10^{- 2} m$

Area of square = $(10 c m)^{2}$

= $100 c m^{2}$ = $100 (10^{- 2} m)^{2}$ = $0.01 m^{2}$

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The length of a side of a square is 10 cm. What is its area in square metre?

The correct option is B 7.9 mGiven, Length of the side (a) = 10 cm Area of square = a2 = (10 cm)2 We know 1 m=100 cm or 1 cm = 10−2 m Area of square = (10 cm)2 = 100 cm2 = 100 (10−2 m)2 = 0.01 m2

The length of a side of a square is $10 c m$ . What is its area in square metre?

The correct option is B
7.9 m

Given,

Length of the side $(a)$ = $10 c m$

Area of square = $a^{2}$ = $(10 c m)^{2}$

We know $1 m = 100 c m$ or $1 c m = 10^{- 2} m$

Area of square = $(10 c m)^{2}$

= $100 c m^{2}$ = $100 (10^{- 2} m)^{2}$ = $0.01 m^{2}$