The "Many Triangles" problem
In the figure below, the lines BC, AD and FT are parallel. Lines BF, GH and CT are parallel.
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How many right triangles
(If you are assuming the angle abk, and the three others like it, is 90° you will need to prove it first).
How many triangles altogether?
What is the total area of the figure?
Resources (and perhaps clues)
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