The sketch on the far right shows a way that the steps could fold out, instead of being completely flat, they could have a flat surface and an angled surface. This will make the whole step much stronger. The step and underside of the step will be different lengths. If I know how long the flat surface and the gap from where the flat surface joins the wall and where the angled surface joins the wall, I will be able to work out how long the angled surface is, as it is the hypotenuse.
Length of hypotenuse c = √(a2 + b2)
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