The area of a rectangle is 18\;{cm}². If one of its sides is 2 cm long, find its perimeter.

Correct Answer is : 22 cm22\;{cm}22cm

Correct Answer is : 22 cm22\;{cm}22cm

Test Index

BECE Mathematics 2021 Paper

Question : 12

Total: 40

18\;\text{cm}^2

Solution:

Concept:

A rectangle's area is

\text{length} \times \text{breadth}

, and its perimeter is

2(\text{length} + \text{breadth})

Explanation:

Let the known side be

L = 2\;\text{cm}

The given area is

18\;\text{cm}^2

So,

L \times B = 18

Substitute

L = 2

2 \times B = 18

Divide both sides by 2:

B = 9\;\text{cm}

Now, perimeter

= 2(L + B)

Perimeter

= 2(2 + 9) = 2 \times 11 = 22\;\text{cm}

Answer:

The perimeter is

22\;\text{cm}

, so the correct option is C.

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