If the height and slant height of a cone are 21 cm and 28 cm respectively. Find its volume.
We have ,
Height of cone h = 21 cm
Slant height l = 28 cm
Radius of cone = √(l2-h2) = √( 282 – 212) = √343 = 7√7 cm
Volume of cone = 1/3×22/7×7√7×7√7×21
= 2401π cm3