Find the CSA of the right circular cone whose radius is 7cm and the slant height is 4cm
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Curved surface area =πrl
=
7
22
×7×10
=220 cm
2
Given, Radius of cone, r=7cm and Height, h=24cm.
To find slant height l:
We know, l
2
=r
2
+h
2
⟹ l
2
=7
2
+24
2
⟹ l
2
=625
⟹ l=25cm.
Therefore, curved surface area of cone is =πrl
=
7
22
×7×25
=22×25
=550cm
2
.
Hence, the curved surface area of cone is 550cm
2
.
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Answer:
Curved surface area =πrl
=
7
22
×7×10
=220 cm
2
Given, Radius of cone, r=7cm and Height, h=24cm.
Explanation:
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