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13 cards from this deck
Total area of all outer surfaces of a 3D shape
πrl\pi rlπrl
Slant height (apex to edge of base)
πr2+πrl\pi r^2 + \pi rlπr2+πrl
Use Pythagoras' theorem
l2=h2+r2l^2 = h^2 + r^2l2=h2+r2
4πr24\pi r^24πr2
2πr22\pi r^22πr2
3πr23\pi r^23πr2
Count external surfaces only, not internal
Base area + curved surface area
4 times area of great circle (πr2\pi r^2πr2)
Confusing vertical height with slant height
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