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Circle
A circle is a shape in which all points are the same distance from the center. Circles are named after their centers. Therefore, the right circle is called circle A because its center is at point A. Real-world examples of circles include (the surface of) wheels, dinner plates, and coins.
A=πr2
Radius
The radius of a circle is the gap from the middle of a circle to any factor at the circle. If you location radii end-to-result in a circle, you will have the equal period as one diameter. Thus, the diameter of a circle is two times so long as the radius.
r=c/2π
Chord
A chord is a line segment that connects two points on a curve. In geometry, chords are often used to describe line segments that connect two endpoints on a circle. The circle on the right contains the AB code. If this circle is a pizza pie, you can slice the pizza along the AB code. Cutting along the AB code cuts the slice of pizza that includes that code.
Chord Length = 2 × √(r2 − d2)
Chord Length = 2 × r × sin(c/2)
Diameter
The distance on the circle passing through the center is called the diameter. A practical example of a diameter is a 9 inch disc.
d = 2r
To learn more about the equation refer:
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