Question: Why do you suppose that girders are so often arranged to form triangles in the construction of bridges and other structures? (Compare the stability of

Why do you suppose that girders are so often arranged to form triangles in the construction of bridges and other structures? (Compare the stability of three sticks nailed together to form a triangle with four sticks nailed to form a rectangle, or any number of sticks to form multi legged geometric figures. Try it and see!)

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