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Head First 2D Geometry by Dawn Griffiths, Stray

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Jus
t try drawing a squar
e which
doesn’t hav
e four angles a
ll 90º
and a
ll sides the same ra
tio: 1/1.
similarity and congruence
You sketch it—we’ll etch it (to fit)
Liz is a very patient customer, she’s hung around while you used
similarity and proportionality to resize the design to fit perfectly
on her new replacement phone. It does look good though!
I love it, thanks!
Similar shapes have the same angles.
Similar shapes have the same ratios
between lengths of sides.
Similar triangles have the same three angles
(and you can tell from just two).
Some shapes are always similar.
All circles are similar.
All squares are similar.
you are here 4 77

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