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36 Divide by two. 18,2 Divide by two. 9,2,2 Divide by three. 3,3,2,2 Stop.
81 Divide by three. 27,3 Divide by three. 9,3,3 Divide by three. 3,3,3,3 Stop.
Use the LOG key, divide the result by 3 then use the 10x key.
Divide the diameter by 2.
Divide the rectangle in two triangles and then use the pythagorean theorem to find the remaining sides.