base x height - area of a parallelogram, length x width - area of a rectangle, 1/2 x base x height - area of a triangle, 1/2 x (base 1 + base 2) x height - area of a trapezoid, pi x diameter - circumference of a circle, pi x radius squared - area of a circle, 2 (length x width) + 2 (length x height) + 2 (width x height) - surface area of a rectangular prism, length x width x height - volume of a rectangular prism, pi x radius squared x height - volume of a cylinder,

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