WAEC - Mathematics (1999 - No. 25)

The height of a pyramid on square base is 15cm. If the volume is 80cm\(^3\), find the length of the side of the base

3.3cm

5.3cm

4.0cm

8.0cm

Volume = \(\frac{1}{3} b^2 h\)

\(\therefore b = \sqrt{\frac{3v}{h}}\)

\(b = \sqrt{\frac{3(80)}{15}} \)

\(b = \sqrt{16} = 4.0 cm\)