The area of a rectangle is base x height. Here the base is the sum of the parallel sides of the original trapezium. The blue + orange lengths. Image caption, STEP FOUR - 1 TRAPEZIUM = ½ RECTANGLE ...
The subject of a formula is the variable that is being worked out. It can be recognised as the letter on its own on one side of the equals sign. For example, in the formula for the area of a ...
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