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WAEC Mathematics 2020 Paper

Question : 17

Total: 48

Solution:

Concept:

The total surface area of a cuboid is the sum of the areas of all six rectangular faces.

Explanation:

Given: length

l = 7

cm, width

w = 5

cm, height

h = 4

cm.

Formula for total surface area is:

2(lw + wh + lh)

Substitute the given values:

2(7 \times 5 + 5 \times 4 + 7 \times 4)

Calculate each product:

2(35 + 20 + 28)

Add the terms inside the bracket:

2(83)

Multiply by 2:

166

Therefore, the total surface area is

166

^{2}

Answer:

166

^{2}

which is Option B.

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