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irina1246 [14]
4 years ago
9

Kelly made a blueberry pie. After measuring the pie tin, Kelly calculated it has an area of 78.5 square inches. What is the pie

tin's diameter? (Using 3.14 as pi)
Mathematics
1 answer:
Lostsunrise [7]4 years ago
6 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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