Circles
Free Math Games & Activities for Kids
A circle is a shape consisting of all
points in a plane that are a given distance from a given point. An
arc is a curved line that is part of the circumference of the
circle.
Kool Circle Facts:
Kool Circle Facts

A straight line from the center of a circle to the edge is called the
radius.

A straight line that passes from one side of a circle to the other through
the center is called the diameter.

The distance around the outside of a circle is called the circumference.

All points on the edge of a circle are the same distance to the center.

The value of Pi (π) to 2 decimal places is 3.14, it comes in handy when
working out the circumference and area of a circle.

The circumference of a circle can be found with the following formula:
Circumference = π d

The area of a circle can be found with the following formula: Area = π rē

An arc is part of the circumference of a circle.

A chord is a straight line joining two points on a circle, the diameter is
an example of a chord (the longest possible one).

A segment is the region between a chord and the arc it joins.

A tangent is a straight line that touches a single point of a circle.

A sector is the region between an arc and two radii.

The full arc of a circle measures 360 degrees.

A semicircle is a shape that forms half a circle, the arc of a semicircle
measures 180 degrees.

Circles have a high level of symmetry.

A circle has the shortest perimeter of all shapes with the same area.
Circle
Games:
Classroom game outdoors Circles Geometry Math
Circles and Squares Puzzle Game
20 Circle math games for all levels