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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
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
A cone with a slant height of 22cm and radius of 7cm has a total surface area of about 637.74cm2