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What is the exact volume of a cylinder that has a height of 1.8 ft and a radius of 6.1 ft?
Volume = (pi) x (radius of a round end)² x (height)
= (pi) x (6.1-ft)² x (1.8-ft)
= (pi) x (37.21 square feet) x (1.8-ft)
= 66.978 π cubic feet
Since π (pi) can't be written exactly, no number it appears in can be written exactly either. The only way to indicate the exact value of such a number is to leave the symbol 'π' in it.
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