Download - Surface area of cone

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Surface area of cone

Surface area of cone

l

2πr

l

2πr

l

Area of a circle having sector (circumference) 2π l = π l 2

Area of circle having circumference 1 = π l 2/ 2 π l

So area of sector having sector 2 π r = (π l 2/ 2 π l )x 2 π r = π rl

Surface area of cone