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Head First 2D Geometry by Dawn Griffiths, Stray

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evaluating new evidence
Weve got a new sketchnow for a new
ballistics report
Following up on Benny’s story, officers have returned to the scene, and
found footprints, a broken window, and a set of tire trackes that might
indicate that he’s telling the truth. But there’s a big problem—from where
Charlie appeared to be standing, he can’t have shot Micky through the
door, plus the bullet that killed him came from the outside the building!
We do know that the bullet must have traveled in a straight line headed in
the direction shown on the sketch, but how it got there is the big question.
BULLET
PATH
DOOR
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
Q:
The dotted line extending the bullet path—how do we
know it’s really straight?
A:We’re going to start by saying that this line MUST be
straight heading backward from where the bullet entered the wall,
and then work up the sketch to find out how the bullet came to be
traveling in exactly that trajectory.
26 Chapter 1

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