Test Index

WAEC Mathematics 2014 Paper

© africaexams.com

Question : 3

Total: 49

The volume of a cube is 512cm³. Find the length of its side

6cm
7cm
8cm
9cm

Solution:

Concept:

The volume of a cube is found by cubing the length of its side.

Explanation:

Let the side length be

L

.

Volume of cube

= L^3

.

Given volume

= 512\ \mathrm{cm}^3

.

So,

L^3 = 512

.

Take the cube root:

L = \sqrt[3]{512}

.

Since

512 = 8 \times 8 \times 8 = 8^3

,

L = 8\ \mathrm{cm}

.

Answer:

The length of the side is

8\ \mathrm{cm}

.

Correct option: C.

8\ \mathrm{cm}

.

© africaexams.com

Go to Question:

Prev Question

Next Question