1. What is the difference in the cross-sectional area (area of the opening) between a…

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.

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2. An attic area requires 400 square inches of opening area
for ventilation. How many 8-inch-diameter openings are needed?