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  I know another way which is basically the same and the why. So it is just base x height divided by 2. The base of a square for example can be 4. Then the height of the square (the length) can be 3. Cutting a square in several pieces it is possible to get a triangle. Triangles are contained in any polygon.

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  @readingallday Absolute value is a number's distance from 0. This is why positive numbers stay positive, and negative numbers become positive in these problems, as we are just counting how many units a number is from zero. Ex: (-7 is 7 units away from 0 & 7 is also just 7 units away from 0 but in opposite directions).