November 2009
Beginner
368 pages
8h 55m
English
Content preview from Head First 2D Geometry
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224 Chapter 5
compare areas
We need to find the area of the two pizza deals
MegaSlice offers two 12" pizzas for the same price as one of
Mario’s 18" pizzas.
So, which deal is more AREA of pizza, because that’s the
property you actually get to eat.
OK, you could kind of nibble the
circumference if you wanted....
What property of the pizzas do you need to compare to be able to
work out whether MegaSlice’s claims are true?
Area
Which is more?
18"
12"
12"
If you put “Volume” here, you’re right,
but as all Mario’s pizzas have the same
thickness, area will also cover it. More on
that in Chapter 7!
you are here 4 225
circles
Frank: Not so fast. I’m not sure it’s that simple.
Joe: What’s hard about it? 12 + 12 = 24. 24 is way more
than 18. Game over.
Jim: But that’s not area—that’s diameter!
Joe: Yeah—and?
Jim: Well, I’m not sure that you can just add up diameters
and then compare them instead of comparing area.
Joe: Why not? Anyway, we don’t even know how to find
the area of a circle. Hey—is this making you guys hungry?
Frank: Shut up! This is serious. We need to find a way to
compare the actual pizza area, and not just the diameters.
Jim: Agreed, but where do we start?
Frank: Well, I guess we should just start from what we do
know and go from there.
Which technique from your Geometry Toolbox could ...
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