1. Below is a right triangle. Dissect it into three pieces so that you have 1 rectangle and 2 triangles.

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2. Now dissect this right triangle into three pieces so that you have 1 rectangle and 2 triangles—with one more condition: *the three pieces can be reassembled to make a rectangle*:

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3. Dissect this square into 4 triangles, which can be reassembled to make a non-square rectangle: