A cone is the space figure that is generated by a right triangle turning around one of its cathetus.

     A = π·r2 + π·r·g  (g = slant height)




1.- For a party, Louis has made about 10 conical hats out of cardboard. How much cardboard was used in total if each cap has a radius of 15 cm and a slant height of 25 cm?

2.- Calculate the total area of a cone whose slant height is 13 cm and its base radius is 5 cm.





Solutions: 1) 11780.97 cm2; 2) 282.74 cm2

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