The volume of a sphere V, is
V = (4/3) x Pi x R3.
In our case R = 0.65 m, and Pi = 3.1415926...
Therefore V = 1.150 m3
Therefore 90% of this is 1.035 m3.
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The diameter of a regulation beach volleyball is 26 inches. What is the volume?
Volume of the beach ball: 4/3*pi*radius^3
It works out as 2.580762042 or about 2.581 cm
Volume = 4/3*pi*143 = about 11494 cubic inches
The answer is to use the metric system like the rest of the world.