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WAEC Mathematics 2022 Paper

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Question : 41

Total: 47

A rectangle with width

\frac{3}{4}

\frac{3}{8}

^2

. Find the length

6cm
4 $\frac{1}{2}$ cm
2 $\frac{5}{8}$ cm
12cm

Solution:

Concept:

The length of a rectangle is found by dividing the area by the width.

Explanation:

Area of rectangle

=

length

\times

width.

So, length

=

area

\div

width.

Area

= 3\frac{3}{8} = \frac{27}{8} \, \text{cm}^2

.

Width

= \frac{3}{4} \, \text{cm}

.

Length

= \frac{27}{8} \div \frac{3}{4} = \frac{27}{8} \times \frac{4}{3}

.

Length

= \frac{108}{24} = \frac{9}{2}

.

\frac{9}{2} = 4\frac{1}{2} \, \text{cm}

.

Answer:

The length is

4\frac{1}{2}\,\text{cm}

, which is option B.

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