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Find the total surface area of …

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Find the total surface area of a cone whose radius is 2 r units and slant height is 2l units.

Posted by Shantanu Sonawane 5 years, 1 month ago

CBSE > Class 09 > Mathematics

1 answers

Yogita Ingle 5 years, 1 month ago

given
slant height = 2l
radius = 2r

total surface area of the cone = 2π*radius(radius+slant height)
=2π*2r[2r+2l]
= 4πr 2(r+l)

= 8πr (r +l) sq units

1Thank You

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CBSE > Class 09 > Mathematics