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1. What is the difference in the cross-sectional area (area of the opening) between a 12-inch-diameter culvert pipe and an 18-inch-diameter culvert pipe? Answer should be square inches rounded to 1 decimal place.
2. An attic area requires 400 square inches of opening area for ventilation. How many 8-inch-diameter openings are needed?

1. Cube with sides of 10 feet 6 inches. Answer should be in
cubic feet rounded to 1 decimal place.
2. Rectangular solid with a width of 5½ inches, length of 3
feet 3 inches, and height of 8 inches. Answer should be in cubic inches.

A board foot is the amount of lumber contained in a board
that is 1 inch thick, 1 foot wide, and 1 foot long (Fig. 11-13).
Fig. 11-13

A cellar excavation needs to be 32 feet wide by 44 feet long
by 6 feet deep. If the earth is hauled away from the site in dump trucks that
carry 12 cubic yards each, how many truckloads must be removed? Round off your
answer to the nearest truckload.

One end of a guy wire is attached to an antenna tower at 40
feet from the ground, and the other end is attached to an anchor 14 feet 6
inches from the tower (Fig. 12-4). How long is the guy wire? Express the answer
in feet rounded to 2 decimal places and in feet and inches rounded to the
nearest ½ inch.
Fig. 12-4