The ideas in this geometry lesson are taken from Math Mammoth Geometry 1 book.
Area of right triangle
Free geometry lesson plan from HomeschoolMath.net
|In the following pictures the rectangle is divided up into two right
The thus formed two right triangles are identical in the sense that if you could
move them on top of each other, they would exactly match.
|Let us look closer at the last triangle in the previous paragraph. Hopefully you figured out that its area is 12. To confirm that we can actually count the little squares in the triangle. Note that some parts don't form a whole square, but combining them we get whole squares and can then count them.|
|[picture omitted from Free lesson plan; available in the ebook]|
Example problem types
|1. Find out the area of the following right triangles.|
|2. Here you see two different shaped
right triangles that both have the area of 10:
In each case draw 3 different
right triangles that