cone

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)

 

 

Exercises:

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