Total surface area of a cone is 616 sq.cm . If the slant height of the cone is three times the radius of the base , find its slant height.

Bharti Phalle

Feb. 8, 2018, 7:46 p.m.

Answers!

poonam sharma

Feb. 9, 2018, 5:52 p.m.

πr(r l)=616
πr(r 3r)=616
πx4r=616
r=616/4
r=154cm

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