a semicircular sheet of diameter 28 cm is bent to make a cone find the volume and surface are of cone
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Answer:
Volume of cone
= 275.86 cm^3
Surface area of cone
= 308 cm^2
Step-by-step explanation:
Radius of cone
2πr = 28
r = 28/2π
r = 14/π
r = 4.45
Slant height of cone = 28/2 = 14
Height of cone
= √14^2 - (14/π)^2
= 13.27
Volume of cone
= 1/3 x π (4.45)^2 x 13.27
= 275.86 cm^3
Surface area of cone = area of semi-circle
= 1/2 x π x 14^2
= 308 cm^2
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