The surface area of a cone consists of 2 parts:
- The circular base: Abase = r2
- The sides:             Aside = r L
where L is the length of the side, called the 'slant length'.
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If you cut a cone along the side L and lay it out flat, it looks like this:
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When you cut up a solid figure and lay it out flat (like this), that is called a geometry net
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