IIr( l + r ) where II is 22/7
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it stands for the total surface area
A cone with a radius of 7 and a slant of 12 has a total surface area of about 417.83 units2
Use a calculator and you'll get yurh answer
A cone with a diameter of 15 and a slant height of 15 will have a total surface area of about 530.14 units2
Curved Surface Area of a Cone:Multiply the base radius of the cone by pi. Multiply your answer by the length of the side of the cone.Then add the surface area of the base of the cone using the area of a circle = pi x r2