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Head First 2D Geometry
book

Head First 2D Geometry

by Stray (Lindsey Fallow), Dawn Griffiths
November 2009
Beginner content levelBeginner
368 pages
8h 55m
English
O'Reilly Media, Inc.
Content preview from Head First 2D Geometry
parallelograms
238 Chapter 6
The lawn is a parallelogram
It kinda looks like a rectangle, but squished down so the sides are
slanted. A parallelogram is a four-sided shape whose opposite
sides are parallel to each other.
So what should you charge?
We need to calculate the charge for mowing a lawn in the shape
of a parallelogram, and to do this, we need to work out the area.
You know how to do that for a rectangle, but would that work for a
parallelogram, too?
A rectangle:
A parallelogram:
Rectangles have two pairs of
parallel sides. The parallel sides are
also congruent.
Each of the four corners forms a
right angle.
Parallelograms have two pairs of
parallel sides, too, and like a rectangle,
the parallel sides are also congruent.
Unlike a rectangle, the corners of a
parallelogram aren’t right angles. The
most we can say is that opposite corner
angles are congruent.
A parallelogram is
a four-sided shape
whose opposite
sides are parallel.
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Publisher Resources

ISBN: 9780596808365Errata Page