Volume in Cubic feet

Question

What polyhedron or other 3-dimensional shape would you use to model a tree trunk? (Rectangular prism, triangular prism, square prism, or cylinder). If the height of the tree trunk is 13 ft and the radius is 1.5 ft, what is the volume in cubic feet? Round to the nearest tenth.

Answer 1

The dimensions given are that of a cylinder....

V = 22/7 * radius^2 * height

= 22/7 * 1.5 ^2 * 13

= 91.9285714 = 91 and 13/14

Answer 2

Volume of cylinder: V = ∏r²h

V = 3.14*(1.5)²*(13) = 91.845

To nearest tenth, that is 91.8 ft³

V = 3.1415926*(1.5)²*(13) = 91.89158

To nearest tenth, that is 91.9 ft³

"Round to the nearest tenth" is something that you would only find in a math problem. Anybody with a ruler would round to the nearest 1/12 ft [that is, to the nearest inch].