A hiker begins on top of a mountain that stands 12,500 feet above sea level. He walks down to the valley that is 250 feet below
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Find the area of the total circle and when you find that area, multiply it by 145/360 for that is how much of the circle that area is.
Area of circle, r^2 and 13.69 times 3.14 is 42.9866. Then multiply by 145/360 to get about 17.3 inches squared.