November 2009
Beginner
368 pages
8h 55m
English
Content preview from Head First 2D Geometry
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you are here 4 193
triangle properties
Special Oer
60% o!
$750
SCREEN WAREHOUSE
Only slightly damaged, these screens still present a
crystal clear image but with uneveness in the viewable
range to each side.
Will the special offer screen still do the job?
The screen is suitable if the viewable range (r) reaches
all the way to the back—but you only have the sides
given on the specification in the ad.
What technique from your Geometry Toolbox can help you find
the screen’s viewable distance, r?
25
28 31
30
r ?
28 31
30
Web ad for the
special offer
screens
194 Chapter 4
a new tool for your geometry toolbox
The screen viewing area is a scalene triangle
This means that when you add an altitude, it doesn’t bisect
the base. Instead of creating two nice, neat congruent right
triangles, you get two different right triangles. And you don’t
know the base of either of them!
Altitude
The two right triangles still work with the Pythagorean
Theorem, and we know that x and y together make 30 (but
aren’t equal to each other) so we could figure this out with a set
of three simultaneous algebra equations. If that sounds bad,
it kinda is. Don’t go there. But in case you’re tempted, here’s
how it starts out:
What technique from your Geometry Toolbox can help you find
the screen’s viewable distance, r?
The Pythagor ...
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