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Head First 2D Geometry by Dawn Griffiths, Stray

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parallelograms
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.
A rectangle:
Rectangles have two pairs of
parallel sides. The parallel sides are
also congruent.
Each of the four corners forms a
right angle.
A parallelogram:
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.
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 parallelogram is
a four-sided shape
whose opposite
sides are parallel.
238 Chapter 6

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