Answer:
its circumference measures 6π units, its radius = 3πunits
V =(π*r²*height)/3
21 =(π*3²*h)/3
21 = (9π*height)/3
21*3 = 9π*h
63 = 9π*h
h = 63/9π = 7
height = 7 units
Explanation:
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