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Head First 2D Geometry by Dawn Griffiths, Stray

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6
quadrilaterals
Dang it, I should stick
to geometry. I never get
my kites mixed up in the
quadrilateral family tree.
It’s hip to be square
Maybe three isn’t the (only) magic number.
The world isn’t just made up of triangles and circles. Wherever you look, you’ll see
quadrilaterals, shapes with four straight sides. Knowing your way ’round the quad family
can save you a lot of time and effort. Whether it’s area, perimeter, or angles you’re after,
there are shortcuts galore that you can use to your advantage. Keep reading, and we’ll
give you the lowdown.
this is a new chapter 235

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