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GEOMETRIC CONSTRUCTION: CONSTRUCTION OF A CIRCLE

The Circle and its Parts

A circle is a plane figure bounded by a curved line called the circumference.

Parts of a Circle

The Parts of a Circle

The following are the various parts of a circle:

1. Diameter: The diameter is a straight line drawn through the center of a circle and meeting the circumference at both ends.

2. Radius: The radius is a straight line drawn from the center of a circle to any point on the circumference of the circle. A radius is always half of the circle’s diameter.

3. Segment: This is an area of the circle bounded by an arc and a chord.

4. Chord: The chord is a straight line which joins any two given points on the circumference of a circle.

5. Sector: This is the part of a circle bounded by two radii and an arc.

6. Quadrant: The quadrant is the part of a circle bounded by two radii which are at right angles to each other, and bounded by an arc.

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