The main parts of a circle are:

1. Radius: The radius is the distance from the center of the circle to any point on its circumference. It is denoted by the letter “r”.

2. Diameter: The diameter is the distance across the circle, passing through the center. It is twice the length of the radius. The diameter is denoted by the letter “d”.

3. Circumference: The circumference is the distance around the circle. It is the perimeter of the circle and can be found using the formula C = 2πr, where “C” represents the circumference and “π” is a mathematical constant approximately equal to 3.14159.

4. Center: The center is the point that is equidistant from all points on the circumference. It is often represented as the coordinates (h, k), where “h” represents the x-coordinate and “k” represents the y-coordinate.

These parts are interconnected and can be used to calculate various properties of a circle, such as its area, arc length, and sector area.

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