Question

Total surface area of a cone of base radius 8 and vertical angle of 60degrees

Answer 1

H = base/cos60 = 8/(1/2) = 16 unit

area = (1/3) πr²h = 1082.02 square unit

Answer 2

total surface area=1/3πr2h
h=?
h=base/cos 60°
base =8
cos60°=1/2
h=base /cos60°
8/1/2=16
area =1/3πr2h
1/3×22/7×8×8×16=1082.02 sq unit