7 Rectangular Area = length x width.
8 area of the square = side x side.
9 Area of a parallelogram = base x height.
10. of the diagonals of a rhombus = x.
11. the positive side parallel trapezoid = x x. high
12 rectangular area of any length of the diagonal x = x, the sum of the length of the semi-perpendicular to the diagonal.
13. Triangle Area = x base x height.
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