One example is making 7 cans of juice in each of six rows:
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it is 3 squared
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The answer will depend on what the problem is: some can be solved using an array but for others, arrays are a complete waste of time.
When you draw a circle in math, and you draw a triangle inside of it, 2 of the lines should be the radius of the circle, and the third (bottom) line that is not the radius is the chord.