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It's the fourth one...no wait, it's the first one....oh hang on, it could be the second.

Oh dear, looks like my psychic abilities are failing again...without the list of formulae I can't tell you which one it is.

But I can tell you the surface area of a cone:

surface_area_cone = area_base + lateral_surface_area

= ba + la

= πr2 + πrs

= πr(r + s)

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12y ago

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