69. Find the slant height, volume, curved surface area and the whole surface area of a cone of radius 21 cm and height 28 cm.
A. 35m B.55m
C.48m D.18m
Answer:
Here, r = 21 cm and h = 28 cm.
Slant height, l = Ör2 + h2 = Ö (21)2 + (28)2 = Ö 1225 = 35cm
