The area of a rectangle is 18\,{cm}². If the width is 2 cm , find its perimeter.

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

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

Test Index

BECE Mathematics 2024 Paper

Question : 22

Total: 40

18\,\mathrm{cm}^2

Solution:

Perimeter is the sum of all the sides of a shape.

A rectangle has 2 equal lengths and 2 equal widths.

2 \times

Length

+2 \times

Width

=

Perimeter.

Area of a rectangle

=

Length

\times

Width

Area

=18

Width

=2

18=

Length

\times 2

Divide both sides by 2

Length

=\;\frac{18}{2}=9\,\mathrm{cm}

Perimeter

=2 \times 9\,\mathrm{cm}+2 \times 2\,\mathrm{cm}

Perimeter

=18\,\mathrm{cm}+4\,\mathrm{cm}

Perimeter

=22\,\mathrm{cm}

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