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Head First 2D Geometry
book

Head First 2D Geometry

by Stray (Lindsey Fallow), Dawn Griffiths
November 2009
Beginner content levelBeginner
368 pages
8h 55m
English
O'Reilly Media, Inc.
Content preview from Head First 2D Geometry
4 Chapter 1
assessing the crime scene
Do the angles between Benny, Micky,
and the bullet match up?
At the crime scene, the investigators took some measurements
and sketched the positions of Benny, Micky’s body, and the point
where they found the bullet in the wall, all relative to the building
where the crime took place.
They must have been busy that day, because
they didn’t measure everything! But, they
found one important detail: the bullet
entered the wall at an angle of 18º through
the front wall.
So, to solve the crime, all you have to do is
prove that from where Benny was standing
to the target (Micky), the bullet would have
traveled in a straight line that joins up
perfectly with the bullet path.
BULLET
PATH
DOOR
MICKY
BENNY
FOOTPRINTS
BULLET FOUND
STUCK IN WALL HERE
18º
CRIME SCENE SKETCH
CASE GEO180
(ANGLES AS MEASURED
BUT DRAWING NOT TO
SCALE)
81º
86º
BULLET
PATH
MICKY
BENNY
18º
The line Benny would
aim down to hit Micky.
How the bullet was
traveling when it
hit the wall.
PLAN VIEW
Top-down view of the
crime scene
(CHALK OUTLINE
OF HIS BODY)
If Benny shot Micky, these
two line segments must join up
to make a straight line.
you are here 4 5
finding missing angles
Well, this is easy! You can see just
by looking at it that the line from
Benny to Micky and the line for the bullet
path join up to make ...
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Publisher Resources

ISBN: 9780596808365Errata Page