Question

from a solid cylinder whose height is 2.4 and diameter 1.4, a conical cavity of the same height and same diameter is hollowed out. Find the total surface area of the remaining solid

Answer 1

Given,
H=2.4m
r= 1.4/2=0.7m
Total surface area of cylinder =2πr(r+h)
=2×22/7×0.7(0.7+2.4)
=341/25
= 13.64m