Area of circular base of a right circular cone is 78.5cm2. If it's height is 12 cm then find the volume of cone
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= 78.5 cm²
Height (h)
= 12 cm
Assumption
Radius be “r cm”
Also,
Slant Height = l cm
As we know that :-
Area of base = πr²
78.5 = 3.14 × r²
r² = √25
r = 5
×3.14×(5)
2
×12
= 3.14 × 25 × 4
= 314 cm³
Hence
l = √h² + r²
l = √{(12)² + (5)²}
l = √(144 + 25)
l = √169
l = 13 cm
Also,
CSA of Cone = πrl
= 3.14 × 5 × 13
= 204.1 cm²
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