It doesn’t ma

tter which p

oints on

the edge y

ou draw y

our diameter

circle

diameter is double the radius

How big are the pizzas that MegaSlice are cutting up and selling by

the slice?

The pizza must be as wide as two

of the slice edges—12 inches.

6”

6”

12”

The diameter of a pizza is twice its radius

The total width of the pizza—12 inches—is a special circle property we

call diameter. The diameter of a circle is the distance from one side to the

other, passing through the center. The length of the edge of the pizza slice

is called radius, and is the distance from the center to any point on the

edge. Diameter is always two times the radius.

between, or wher

e y

ou draw the

radius to, it’s a

lw

ays the same size

(just

remember t

o

include

the

c

enter).

Diameter

Radius

T

he diameter and radius a

lw

ays include

the center of the circle.

Diameter is a

l

ways

t

wic

e the radius:

D = 2r

208 Chapter 5

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