By:Kay McInnis

DiameterDIAMETER is the distance across a circle passing through the center point.

Radius

RADIUS is the distance from the center to any point on the circle.

Diameter RadiusCan you identify the

relationship between the DIAMETER and the RADIUS

of a circle?

Diameter

The RADIUS is half of the DIAMETER.

Radius

CIRCUMFERENCE

CIRCUMFERENCE is the distance around the circle.

CIRCUMFERENCE

The relationship between the DIAMETER and the

CIRCUMFERENCE of a circle is PI.

DIAMETER

The symbol for PI is .

The value of PI is 3.14.

To find the CIRCUMFERENCE of a circle, multiply the DIAMETER

and PI.

C = d x

d = 5 m

Can you figure out the

CIRCUMFERENCE of the circle?

If d = 5 and = 3.14, then CIRCUMFERENCE equals 5 x 3.14. C = 15.7 m

d = 10 cm

Find the CIRCUMFERENCE

of the circle.

10 x 3.14 = CC = 31.4 cm