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Head First 2D Geometry by Dawn Griffiths, Stray

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finding area
How many people can each venue hold?
Your buddies are sure the festival will be a sellout, and at $10
a ticket every extra person counts. Each person needs 2 square
meters of space in the festival field—so how many people can
each venue hold?
Rec
tangle ar
ea is
easy t
o find; i
t’s
jus
t width x height.
Well, area of a rectangle is
width times height. But none of
these are rectangular…so we must
need to do something different....
567982
admit one
rock festiv
al
$10.00
H
W
Area= H × W
That’s right.
The rectangle area formula isn’t a bad
place to start, though.
So how does a triangle relate to a rectangle?
156 Chapter 4

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