User:Alisaunders/sandbox



Properties of a Circle

A circle is a round shaped figure that has no corners or edges. A circle consists of various parts. The parts of a circle are: circumference, arc, segment, chord, diameter, radius, sector, quadrant and tangent.

Circumference - This is the total distance around a circle. The formula for finding the circumference of a circle is 2πr; where π = pi and r = radius.

Arc - This is a portion of the circumference of a circle.

Chord - This is a straight line segment that has both it's endpoints on a arc of a circle.

Segment - This is a region of the circle which is cut off from the rest of the circle by a chord.

Diameter - This is the line that passes through the center of the circle and touches two points on the arc of a circle.

Radius - This is the distance from the center of the circle to any point on the circumference of the circle.

Sector - This is a part of the circle that is made up of a portion of the circumference along with 2 radii of the circle.

Quadrant - A quadrant is a quarter of a circle. Similar to the sector in that it is made up of a portion of the circumference and 2 radii of the circle; except it takes up a quarter of the circle.

Tangent - This is a straight line that touches a circle at only one point.