Draw a rectangle in the ratio of 1:2 eg sides of 5cm & 10cm. Bisect both the longer sides and join their mid points with a straight line. Draw a diagonal.
This gives you 2 squares, 2 big triangles and 2 small triangle (1 in each square)
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Make a two by two grid with six toothpicks, and then place the other two toothpicks at a 45 degree angle on the corner of two of the squares.
draw a big triangle then make a line halfway through it
11
you can't, because the Pythagorean theorem is for right triangles and the triangles formed by the diagonal of a parallelogram are not right triangles.
We can get 29 by using their squares like: (42 + 32 + 22) / 1 = 29