Question

2) Find the TSA of a cone
when its
slant height is 24 cm and base diameter is 21cm​

Answer 1

Step-by-step explanation:

TSA=πr(h+r)

22/7*10.5*34.5

==1138.5cm square

Answer 2

Given:-

• Slant height of the cone = 24cm.
• Diameter of the base = 21cm

To find:-

• Find the TSA of the cone ..?

Solutions:-

• Let the slant Height of the cone 24cm and diameter of the base = 21cm.

We have

Radius = diameter/2

=> 21/2

=> 10.5cm

Now,

Total surface area of cone = πr(l + r)

=> 22/7 × 10.5(21 + 12)

=> 22/7 × 10.5(33)

=> 22/7 × 10.5 × 33

=> 7623/7

=> 1089cm²

Hence, the TSA of the cone is 1089cm².

Some Important:-

• Right circular cone:-
• h = height of cone
• r = Radius of cone
• s = slant height

• Volume = 1/3πr²h
• Lateral surface area = πr √r²+h²
• Total surface area = πr² + πr √r²+h²