Length x width - Area of a rectangle, 1/2 x base x height - Area of a triangle, πr2 - Area of a circle, πd - Circumference, base x height - Area of a parallelogram, 1/2 x (a + b) x height - Area of a trapezium, 2 (length + width) - Perimeter of a rectangle, l x w x h - Volume of a cuboid,

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