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estherboocx
20.05.2020 •
Mathematics
Find the radius of a circle with area equal to 153.86 square feet.
R = ?
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Ответ:
7 feet
Step-by-step explanation:
The area of a circle can be found using:
a=3.14*r^2
We know that the area is 153.86 square feet, so we can substitute 153.86 in for a.
153.86=3.14*r^2
Now, we have to solve for r. To do this, we need to get r by itself. First, divide both sides by 3.14
153.86/3.14=3.14*r^2/3.14
153.86/3.14=r^2
49=r^2
Now, r is being squared. The opposite of squared is the square root. So, take the square root of both sides .
√49=√r^2
√49=r
7=r
The radius is 7 feet
Ответ: