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Pythagoras’ Theorem states that, in a right-angled triangle, the square of the longest side is equal to the sum of the squares of the other two sides.

Compound measures involve two or more different units. Examples of compound measures and their units include density, speed, heart rate), and miles per gallon.

Compound or composite shapes can be made up of two or more shapes or from a shape with a smaller piece removed.

Area is the amount of space taken up by a surface or 2-D shape. It is measured in squares with metric units mm², cm², m² and km².