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Head First 2D Geometry by Dawn Griffiths, Stray

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CHAPTER 6
your geometry toolbox
Your Geometry Toolbox
You’ve got Chapter 6 under
your belt and now you’ve added
quadrilaterals to your toolbox. For a
complete list of tool tips in the book, head
over to www.headfirstlabs.com/geometry.
Quadr
il
a
teral
A fl
a
t s
hap
e wi
th f
our
straight sides.
Para
llelogram
Has t
w
o pair
s of parallel sides
tha
t ar
e a
lso congruent.
Opposite corner angles ar
e
congruent.
Ar
ea = height x base width.
Rectangle
Has t
w
o pair
s of para
llel
congruent sides.
Every corner is a right
angle.
Ar
ea = width x height.
Trap
ezoid
Has one pair of para
llel sides ca
lled bases.
Ar
ea = 1/2 x height x (base 1 + base 2)
Rhombus
Has f
our congruent sides.
Is both a para
llelogram and
a ki
te—so y
ou can use the
ar
ea ca
lcula
tion of ei
ther
s
hap
e.
Kite
Has t
w
o pairs of separate adjacent
congruent sides.
Diagona
ls ar
e p
er
p
endicul
ar.
Area = 1/2 x diagona
l 1 x diagona
l 2
272 Chapter 6

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