4 ms·
A sphere's volume and area are 1/2 that of its box
- gus_massa 12y agoI disagree. It's good that children know that the volume and area of a sphere is something with pi (and can search the exact constant in Wikipedia). I like the idea that the volume of a sphere is half of the volume of the box. I never thought about it. But this is more useful as a rule of thumb and a trick to remind the actual formula: * It's a volume, so it's something like r^3 * It's round, so it has a pi * Half of the box is 1/2 (2r)^3 = 4r^3 * Now: X * pi * r^3 ~= 4 r^3 * And pi ~= 3 so, X * 3 = 4, then X=4/3 and V=4/3 pi r^3