You need 8 cm to measure 8 cm.
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It should be 8 cm.
C = ~25.133 cm
The volume of a sphere with a diameter of 8cm is about 268cm3
Since diameter is 2 x pi x radius, 8 cm / 2 / 3.14 is about 1.3cm. Specifically, 1.2732cm.
Volume = 8cm * 8cm *8 cm = 512 cm3