12' To answer this properly more information is needed about the cone. 12' is just one measure, a cone is a 3 dimensional figure.
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Same basic shape, except a cone has three dimensions, a triangle has two.
A cone needs a three dimensional space in which to exist but it's not a solid, it's a two dimensional surface.
A cone with a radius of 7 and a slant of 12 has a total surface area of about 417.83 units2
9 and 12 are.
A cone has 1/3 the volume of its cylinder. To find the volume multiply the area of the circular base (pi times radius squared) and multiply it by the height of the cone. That is the volume of the cylinder with the same dimensions. Divide this number by 3 to find the area of the cone. Use unit ratios to make sure your answer is in cubic centimeters.