Question

The total surface area of a cone is 103.62 cm Square and its slant height is 5 cm if its base is semicircle then find the total height of a cone Y is equal to 3.14

Answer 1

Answer:

Given,

slant height l=5cm

total surface area A=103.62cm2

Formulae:

l=h2+r2

A=πr(r+l)

⇒r=21l2+4πA−2l

⇒r=2152+4π103.62−25

⇒r=3.76

l2=h2+r2

⇒h2=l2−r2

⇒h2=52−3.762

⇒h2=10.8624

Height, 

h=3.29 cm

Answer 2

Answer:

given

slant height l=5 cm

total surface area A=103.62 cm2

formula.

l=h2+r2

A=πr(r+l)

r=2152+2π103.62-25

r=3.76

l2=hl2

h2=10.9624

h=3.29cm