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Head First 2D Geometry by Dawn Griffiths, Stray

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T
he lawn was or
iginall
y a tidy
rec
tangle. Sup
er easy t
o mow,
and ca
lcul
a
ting charges w
as a
snap!
a new mystery shape
Landowners, unite
Just when all the lawns seemed under control, Edward ran into a little snag.
He turned up at a customer’s house to find that he has been buying up
adjacent land. The neat rectangular lawn that Edward had been mowing
for months has been transformed into…something else.
Before:
28 meters
24 meters
28 meters
After:
24 meters
53 meters
T
he lawn is defini
tel
y
l
arger. It still has f
our
sides, but i
t’s not a s
hape
w
e’v
e seen befor
e.
It’s going to take longer to mow and edge this new lawn, and
Edward needs a hand working out the charges. He took some rough
measurements and gave them to you over the phone, but he didn’t
get all the sides. So what do we do with a lawn like this?
260 Chapter 6
quadrilaterals
Check out the shape of the new lawn. How do you think we could
go about finding the area of a shape like this?
Really?
We can’t do exactly the same thing we
did before because we don’t have all the
measurements we’d need. Let’s take a closer
look.
You’ve GOT to be kidding! This
is way too easy, we’ve done all this
before. All we need to do is split the
shape into a rectangle and two triangles,
and find the total area. Duh!
you are here 4 261

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