Hard
Find the volume of a cone with base radius 21 cm and height 20 cm. (Use π = 22/7)
Explanation
Explanation
Volume of a cone = (1/3)πr²h = (1/3) × (22/7) × 21² × 20 = 9240 cm³.
PRO TIP
Re-check your working by substituting the answer back into the original question.