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ugtguytu8528
20.09.2019 •
Mathematics
Acontractor has installed a silt fence around an area that is semi-circular and level to prevent soil from the construction site entering nearby streams. the diameter of the semi-circle is 1200 feet. how many linear feet of fence does the contractor need to use to enclose the area?
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Ответ:
The answer is
or ![3,085\ ft](/tpl/images/0246/7640/9ede5.png)
Step-by-step explanation:
we know that
The circumference of a circle is equal to
where
D is the diameter of the circle
In this problem, to calculate how many linear feet are needed, find the perimeter of a semicircle
so
we have
substitute the value
Ответ: