College Math

The circle with center O and radius r is congruent to circle with center Z and radius R, if and only if r = R. Circumference: The perimeter of a circle is known as circumference and is enclosed with a definite length which is calculated by using the formula: Circumference = 2πr Where, π is a constant and r denotes the length of the radius of the circle. Area: The area of the circle can be calculated using the following formula: Area = πr 2 The area within a circle that is enclosed by two radii and circumference of the circle is known as a sector . Area of a Sector = 360° ( 2 )

A central angle whose vertex is on the circumference of a circle.

is an angle whose vertex is at the center of the circle. An inscribed angle

is an angle

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