What if I’ve got a triangle which doesn’t have a horizonal
side? How do I draw a bounding rectangle?
A:Use a vertical side if you have one because it does make
things easier, but if you don’t have one, then any side will do.
We’ve talked about sides and angles being the same
in congruent triangles, but how do you know that congruent
triangles have the same area, too?
A:With a bit of flipping and rotation you can always place
congruent triangles on top of one another, and they fit perfectly—so
they must have the same area.
What if I don’t know the size of the bounding rectangle?
A: Good point. We’re going to cover some ways to find that out.
For RIGHT triangles, this
looks sensible. But what
about non-right triangles?
Good question—two of our
fields are not right triangles.
So what can we do?
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