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Head First 2D Geometry by Dawn Griffiths, Stray

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find a screen
If you had to give refunds to all the people in that area, how much
would it cost you? (1 person per 2 square meters and $10 a ticket.)
8
83.5
25
3.5
Area = 8 x 25
+ 2 x 3.5 x 25
2
= 8 x 25 + 3.5 x 25
= 200 + 87.5 = 287.5 sq m
= 287.5 = 144 people = $1440
2
We’ve got a rectangle and two congruent triangles.
T
he c
entroid is at 1/3
of the height f
rom
the base
Ar
ea
of
r
ec
tangle
Ar
ea of tr
iangles, the
2s canc
el, which is nic
e
Round UP to a whole ticket
You need a screen for less than $1,440
Ouch—screens
start at like $2,000!
Wait…this video store has a
special offer on some slightly
damaged screens—that could
save us!
192 Chapter 4
The cost of giving refunds to people behind the drinks stall
would be $1,440. If you can find a screen to rent for less than
that, it would let everybody see the show and you’d still have
some profits to split.

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