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math area of a circle. Radius is exactly half of the diameter of the circle. All the points on the circumference of the circle are at the same distance from the center of the circle.
Or when you know the Diameter. A is the Area. Since p is constant we need only the radius value from the user to calculate the area.
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Math 7th grade Geometry Area and circumference of circles. The area is the space occupied by a shape. P Pi times the Radius squared. Area of a circle diameter.