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 one straight line.
Jill: Hang on—I’m not sure we can really go by eye like that!
Joe: Oh, well, we could use a ruler to check it. But I’m pretty
sure it’s a straight line.
Frank: I don’t think we could trust it, even if the ruler
showed it was straight—the sketch clearly says “drawing not
to scale.” The angles we’ve been given are correct, but if you
checked it with a protractor the lines on the sketch wouldn’t
necessarily be the same angles as at the scene itself.
Joe: What? Well, it’s useless then, isn’t it?
Frank: It’s not useless—if it says 18º on the sketch then it
was 18º at the scene because they measured it there. But I
don’t think we can go on what the sketch looks like. We’re
going to actually have to work out whether the line segments
really join up into one straight line.
Joe: But we’ve only got three angles to go on. I bet the chief
will say we need to fill them all in. He’s gonna be mad.
Jill: What if we could find a way to guess some angles based
on other angles or something? But that just sounds really
inaccurate—not exactly good for our case in court!
Frank: It sounds like the right kind of approach though. And
anyway, I think they’ve measured five angles, not just three.…
Does the sketch tell you five angles, or just three?
Is there a way you could start to find some of the angles you haven’t
been given on the sketch?
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