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Step-by-step explanation:
diameter = 2 × radius.
15.5 = 2 × r.
r = 15.5 ÷ 2.
r = 7.75.
volume = πr²
v = π × 7.75².
v = 188.7.
I ain't confident about the volume answer but, the diameter answer is correct.
hope it helps. :)