the radius of base of a cone is 9 cm and its height is 40 cm what is its curved surface area ? what is its total surface area ?(π 3:14)
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you take value of height at the place of slant height
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l=√h^2+r^2
l=√(40)^2+(9)^2
l=√1600+81
l=√1681
l=41cm
Curved surface area=πrl
3.14×9×41
3.14×369
1158.66cm^2
total surface area=πr(r+l)
3.14×9×(9+41)
3.14×9×50
3.14×450
141.3cm^2
l=√(40)^2+(9)^2
l=√1600+81
l=√1681
l=41cm
Curved surface area=πrl
3.14×9×41
3.14×369
1158.66cm^2
total surface area=πr(r+l)
3.14×9×(9+41)
3.14×9×50
3.14×450
141.3cm^2
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