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13 cards from this deck
πr2h\pi r^2 hπr2h
2πrh2\pi rh2πrh
2πr(h+r)2\pi r(h + r)2πr(h+r)
43πr3\frac{4}{3}\pi r^334πr3
4πr24\pi r^24πr2
23πr3\frac{2}{3}\pi r^332πr3
3πr23\pi r^23πr2
3D shape with two parallel circular bases and curved surface
Perfectly round 3D shape, all points equidistant from centre
Exactly half of a sphere
Curved half + flat base: 2πr2+πr2=3πr22\pi r^2 + \pi r^2 = 3\pi r^22πr2+πr2=3πr2
Set volume formulas equal when shapes have same volume
Cancel π\piπ from both sides to simplify calculation
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