Answer #1: Joules (J) or Newton metres (Nm)
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Answer #2: Energy
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YES!!! For example;- A rectangle may have sides of 3 units and 5 uints. To find the area you multiply these two sides together. Hence Area = 3 units X 5 units = 15 sq. units(square units ) Note the use of the word 'square for area units. Theis method of description is used when measurements are in the Imperial System/ However when using the Metric system, , the units are described as 'Units^2'. Volume becomes 'cu.units' ( cubic units) ; Imperial and 'units^3' ( Metric)
The temperature of a person may be measured in either Celsius or Fahrenheit. Measuring temperature in Fahrenheit is unusual these days, as SI units are normally used.
Area is usually not measured, but calculated. For several standard shapes (for example, rectangles, circles, etc.) there are standard formulae to calculate the area; for an arbitrary irregular shape, integration can be used. This basically means mentally cutting the shape into lots of small pieces.
Square units of length. The exact units will depend on the size of the object: A screen pixel may be measured in square millimetres, a postage stamp in square centimetres, a wall in square metres, city blocks in square kilometres.
All types of energy may be measured in Joules.