Question

How much metal sheet will be required to make a cone of height 4 m and base radius 3m? (π = 3.14)

Answer 1

total surface area of cone = πr (r+l)
slant hight = root3^2+4^2
slant hight = 5m
3.14×3 (3+5)
75.36 m^2

Answer 2

Find the slanted height:

a² + b² = c²

4² + 3² = Slanted Height²

Slanted Height² = 16 + 9

Slanted Height² = 25

Slanted Height = √25

Slanted Height = 5 m

Find the total surface area:

Total Surface area = πr² + πrl

Total Surface area = π(3)² + π(3)(5)

Total Surface area = 9π + 15π

Total Surface area = 24π

Total Surface area = 75.36 m²

Answer: Total Surface area = 75.36 m²