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Head First 2D Geometry by Dawn Griffiths, Stray

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T
his is a sect
or.
lw
ays
slices are sectors
Need to work out how many MegaSlices is MegaSlice cutting each of
their pizzas into:
Total slices = 360º = 12
30º
Each slic
e is 30º
Each MegaSlice pizza is cut into 12 slices—so just 10 slices isn’t
even the whole pizza!
Use the information you have about the MegaSlice slices to work
out which is the better $10 pizza deal.
30º
360º in a whole turn
Mario gives you the whole 12" pizza, so Mario’s is a better deal.
1
2
3
4
5
67
8
9
10
Sectors of a circle have angles totaling 360
o
When a circle is divided up using lines that pass through the center
of the circle, the resulting “pizza slice” shapes are called sectors.
The MegaSlice sectors each have 30º angles, so a full pizza from
them would have to be 12 slices (30º × 12 = 360º). But they only
give you 10 slices, which means their deal gives you less than a
whole 12" pizza!
Sec
t
or angles a
add up to 360º
45º
45º 45º
45º
45º
45º45º
45º
30º
30º 30º
30º
30º
30º
30º
30º30º
30º
30º
30º
210 Chapter 5

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