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what the formula for area of circle. Estimate of Circles Area 80 of Squares Area 80 of 9 72 m 2 Circles True Area p 4 D 2 p 4 3 2 707 m 2 to 2 decimals The estimate of 72 m 2 is not far off 707 m 2. 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.
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Area of triangle A ½baseheight. The formula for the area of a circle is pi multiplied by the radius of the circle squared. In geometry the area enclosed by a circle of radius r is pr2.
From the above figure base 2pr and height r.
Put the value of base and height in the area of triangle formula. To calculate the area of a circle you can use the PI function together with the exponent operator. Area of A a 2 20m 20m 400m 2 Part B is a triangle. A pr2 A p r 2 The answer will be square units of the linear units such as mm2 m m 2 cm2 c m 2 m2 m 2 square inches square feet and so on.
