the height of a cone 28 cm and radius of its base 21 cm. find CSA, TSA and volume
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the height of a cone 28 cm and radius of its base 21 cm. find CSA, TSA and volume
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Step-by-step explanation:
Given, height of cone (h)=28cm.
Radius of base (r)=21cm
Slant height of the cone l= √r² +√h²
=√21²+√28²
=√441+√784
=√1225
=√35+√35
l =35cm
CSA of cone =πrl
= 22/7 ×21×35
= 2310cm²
TSA of cone =πr(l+r)
=22/7×21(35+21)
=22×3×56
=3696cm²
Volume = 1/3πr²h
=1/3×22/7×21×21×28
=12936cm³
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