A building casts a shadow in the shape of a right triangle with a base 18 feet wide and a height of 20 feet. What is the total area of the shadow?

The area of a right triangle is one-half times its base times its height. Using 18 feet and 20 feet gives (18 × 20) ÷ 2 = 180 square feet. So the shadow’s area is 180 square feet, choice C.

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