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Romashka [77]
3 years ago
7

What is the radius of a circle with an area of 78.5 cubic inches? use 3.14 for pie

Mathematics
2 answers:
svetlana [45]3 years ago
6 0

Answer:

radius = 5 in

Step-by-step explanation:

Using the formula for calculating the area (A) of a circle

A = πr² ( r is the radius )

here A = 78.5, hence

3.14r² = 78.5 ( divide both sides by 3.14 )

r² = \frac{78.5}{3.14} = 25 ( take the square root of both sides )

r = \sqrt{25} = 5


Harman [31]3 years ago
3 0

Answer:

The radius is 5 in

Step-by-step explanation:

The area of a circle is given by the formula

A = pi *r^2

We know the area  = 78.5 in^2   (volume would be in^3   area is in^2)

78.5 = 3.14*r^2

Divide each side by 3.14

78.5/3.14 = 3.14/3.14*r^2

25 = r^2

Take the square root of each side

sqrt(25) sqrt(r^2)

5 =r

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