The formula for the area of a circle is: Area = π x r2 (r is the radius and Pi is about 3.1416). The result is expressed in square units.
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Pi (3.141...) is used for circles, and circles only. You use it to find the area and circumfrence.
To find the area between two circles with the same center, you need to subtract the smaller circle's area from the larger circle's area. The formula for the area of a circle is A = πr^2, where r is the radius. So, the area between the two circles is calculated as A = π(9^2) - π(5^2) = 81π - 25π = 56π square cm.
The title of the picture is "Circumference and Area of Circles" on page D-60. It's not rocket science, darling. Just turn to page D-60 and feast your eyes on the wonders of circles. You're welcome.
The formula for the area of a square is s2 (sides squared)
the formula for finding the area of an ellipse is add it then multiply and subtract that is the final