SOLUTION: Please help I don't understand Solve the problem. Be sure to show all of your work. The area of a circle with radius r is given by the formula A = πr2 Find the ar

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Question 470580: Please help I don't understand
Solve the problem. Be sure to show all of your work.
The area of a circle with radius r is given by the formula
A = πr2
Find the area of a circle with radius 7 centimeters. Use 3.14 for π.
Answer by ccs2011(207) About Me  (Show Source):
You can put this solution on YOUR website!
The given area equation: A+=+pi%2Ar%5E2
gives the relationship between the area and radius of a circle.
It is a direct relationship so as radius increases, so does the area.
To find a value for A (area) you need a value for r (radius), then substitute it in.
Given: radius = 7, pi = 3.14
Substitute these into A+=+pi%2Ar%5E2
A+=+%283.14%29%2A%287%5E2%29
Do the multiplication
A+=+%283.14%29%2A%2849%29
A+=+153.86
Therefore the area of a circle with radius of 7 cm. is 153.86 sq.cm.