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Head First 2D Geometry by Dawn Griffiths, Stray

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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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