If a cut section of cylindrical tree trunk is 20 feet long and 4 feet around, what is the volume of wood in the section of the tree trunk? (in terms of π)
Circumference = pi*D where D is Diameter, so here: D = 4/pi feet
Cross-sectional Area, A = pi*(D/2)^2 so A = pi*(2/pi)^2 → A = 4/pi ft^2
Volume, V, is A*Length so V = (4/pi)*20 or V = 80/pi ft^3
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