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what is the formula for surface area of a circle. P Pi 314159 o Circle diameter. For example if the radius of the circle is 6 inches first you would square 6 and get 36.
Determining Areas And Perimeters Of Polygons Area And Perimeter Geometry Lessons Algebra Help from www.pinterest.com
Formula to calculate surface area SA of a circle. This tool will calculate the area of a circle from the diameter and will convert different measurement units for diameter and area. Visual in the figure below.
Area semicircle Area circle 2 pr² 2.
Here the Greek letter p represents the constant ratio of the circumference of any circle to its diameter approximately equal to 314159. To find the area using the radius or the length from the center of the circle to the edge use the formula area pr2 where r is the radius. Thats the top the bottom and the paper label that wraps around the middle. Area of a circle p d2 2.
