the circumference of a base of a 12 metre high solid cone is 22m. find the TSA and CSA of the cone ( take pie is equal to 22÷7
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Step-by-step explanation:
The circumference of the base of a cone is 33m.
∴2πr=33
⇒
7
22
×2×r=33
⇒r=
22×2
33×7
=
4
3×7
=
4
21
=5.25m
Now, the height of the cone is 16m.
∴ The slant height l of the cone is l=
h
2
+r
2
=
16
2
+(5.25)
2
=16.84m
∴ The surface area is π×r×l=277.85msq.
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