That's the amount of water in a round pool whose radius is 'r' .
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1 x 314 and 2 x 157
0.6369
The formula is V-E+F=2 and it tells us that if we take the number of vertices a polyhedron has and subtract the number of edges and then add the number of faces, that result will always be 2.
2/3 x 471 = 314
4 2/314/3:= 14 ÷ 3= 4 remainder 2= 4 2/3: