Parts of a circle
Part (name)
Centre Circumference Radius Diameter Chord Segment Sector Arc Tangent Secant |
Description
The middle point, equidistant from all points on the circumference. It is usually shown by a dot and a label of "O". The outside length or the boundary forming the circle. It is the circle's perimeter. A straight line from the centre to any point on the circumference. A straight line from one point on the circumference to another, passing through the centre, A straight line from one point on the circumference to another. The area of the circle between a chord and the circumference. The smaller segment is called the minor segment. The larger segment is the major segment. An area of a circle enclosed by 2 radii and the circumference. A portion of the circumference. A straight line that intersects (that is, touches) the circumference at one point only. A chord extended beyond the circumference on one side. |
Diagram
|
Area of a Circle
The area of space inside a circle is the area.
Given the radius of a circle, the area inside it can be calculated using the formula where:
R is the radius of the circle
π is Pi, approximately 3.142 Calculator
Given the radius of a circle, the area inside it can be calculated using the formula where:
R is the radius of the circle
π is Pi, approximately 3.142 Calculator
Circumference of a Circle
The outside length or the boundary forming the circle. It is the circle's perimeter.
Given the radius of a circle, the circumference can be calculated using the formula where:
R is the radius of the circle
π is Pi, approximately 3.142
Given the radius of a circle, the circumference can be calculated using the formula where:
R is the radius of the circle
π is Pi, approximately 3.142