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Area of a Circle Calculator The formulas linking the diameter and area of a circle reads area = π × (diam 2)2 and diam = 2 × √ (area π) For instance, the diameter of a circle with unit area is approximately equal to 1 128 because diam = 2 × √ (1 π) ≈ 1 128
Area of a Circle - Math is Fun Enter the radius, diameter, circumference or area of a Circle to find the other three The calculations are done "live": The area of a circle is: Example: What is the area of a circle with radius of 3 m ? How to Remember? It is interesting to compare the area of a circle to a square: A circle has about 80% of the area of a similar-width square
5 Ways to Calculate the Area of a Circle - wikiHow To find the area of a circle, use the formula A = π • r2, where r is the radius of the circle If you only know the diameter of the circle, then use the formula A = π • (d 2)2 where d is diameter
Circle Calculator Use this circle calculator to find the area, circumference, radius or diameter of a circle Given any one variable A, C, r or d of a circle you can calculate the other three unknowns Units: Note that units of length are shown for convenience They do not affect the calculations
Area of a circle - Math. net Using A = πr2, The formula for the area of a circle can be proven in a number of ways One such way involves breaking the circle into equal sectors and rearranging them to construct a parallelogram In the figure above, the circle with radius r is broken into 16 sectors of equal area