SOLUTION: A post is 11 ft. in length, 9 in. square at the bottom, and 4 in. square at the top. Find amount of board feet.
1 board foot is 1 ft. long, 1 ft. wide, and 1 in. thick.
Not
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1 board foot is 1 ft. long, 1 ft. wide, and 1 in. thick.
Not
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Question 1130881: A post is 11 ft. in length, 9 in. square at the bottom, and 4 in. square at the top. Find amount of board feet.
1 board foot is 1 ft. long, 1 ft. wide, and 1 in. thick.
Not sure how to solve. Non-homework. Answer by ikleyn(52781) (Show Source):
Use the formula for the volume of a frustum of a square pyramid
V =
where a and b are the base and top side lengths of the truncated pyramid, and h is the height.
In your case a= = 3 inches; b= = 2 inches and h = 11 ft = 11*12 = 132 inches.
Do the rest on your own.
