November 2009
Beginner
368 pages
8h 55m
English
Content preview from Head First 2D Geometry
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xiv
It’s not just pizza—it’s war! 206
How does MegaSlice’s deal measure up? 207
The diameter of a circle is twice its radius 208
How do slices compare to whole pizzas? 209
Sectors of a circle have angles totaling 360° 210
MegaSlice’s $10 deal is a con! 211
Pepperoni crust pizza—but at what price? 212
The pepperoni perimeter is 3 (and a bit) times diameter 214
Mario wants to put your pepperoni crust pricing formula to the test 217
The customers are always fussy 219
An arc is a section of the circumference 221
Mario’s business is booming! 222
But MegaSlice is at it again... 223
We need to find the area of the two pizza deals 224
Each sector (slice) is a triangle (kind of) 226
Area of a circle =
πr² 231
Mario’s pizza is here to stay 233
Your Geometry Toolbox 234
π
table of contents
5
Going round and round
OK, life doesn’t have to be so straight after all!
There’s no need to reinvent the wheel, but aren’t you glad you’re able to use it? From
cars to rollercoasters, many of the most important solutions to life’s problems rely
on circles to get the job done. Free yourself from straight edges and pointy corners—
there’s no end to the curvy possibilities once you master circumference, arcs, and
sectors.
circles
10 Megaslices for the same
price as 8 Mario-Slices
25%
more
pizza
MEGASLICE $10 DEAL
Pi
50 bits ...
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