WAEC - Mathematics (1989 - No. 33)
Find the volume of a cone of radius 3.5cm and vertical height 12cm [Take π = 22/7]
3.4cm3
15.5cm3
21.0cm3
42.0cm3
154.0cm3
Paaiškinimas
The volume of a cone = \(\frac{1}{3}\) x \(\pi\) x r\(^2\) x h
= \(\frac{1}{3}\) x \(\frac{22}{7}\) x \(\frac{7}{2}\) x \(\frac{7}{2}\) x 12 = 154cm\(^3\)