November 2009
Beginner
368 pages
8h 55m
English
Content preview from Head First 2D Geometry
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you are here 4 31
finding missing angles
Use what you know to
find what you don’t know
By spotting patterns around the angles that you do know, you can
work out the angles that you don’t yet know. Sometimes, like with
vertical angles, you don’t even have to do any math.
Here are some patterns for you to look out for:
Angles on a
straight line
Complementary
angles
Vertical angles
On the sketch, mark all the new angles you need to find to solve
the crime (there are at least 11).
BULLET
PATH
MICKY
BENNY
FOOTPRINTS
BROKEN
GLASS
18º
CRIME SCENE SKETCH
CASE GEO180
(ANGLES AS MEASURED
BUT DRAWING NOT TO
SCALE)
72º
CHARLIE
FOOTPRINTS
28º
158º
TIRE
TRACKS
56º
Equal angles
Triangles
We’ll assume that this is a
straight line and work back
toward the bounce angles.
These aren’t
the angles you
found before.
moving beyond triangles
32 Chapter 1
Mark on the sketch all the new angles you need to find to solve
the crime (there are at least 11).
BULLET
PATH
MICKY
BENNY
FOOTPRINTS
BROKEN
GLASS
18º
CRIME SCENE SKETCH
CASE GEO180
(ANGLES AS MEASURED
BUT DRAWING NOT TO
SCALE)
72º
CHARLIE
FOOTPRINTS
28º
158º
TIRE
TRACKS
56º
1
2
3
4
5
67
8
9
10
11
OK, angles 1 and 2,
we can find, but what
about angle 3?
Jill: What’s the problem? We just keep going like we have been.
Frank: But the room isn’t triangular—it has four sides.
158º
28º
Charlie
The room
has four ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.