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Question

# What do you understand by the quantity called ‘area’?

A

It is the quantity of an object

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B

It is the length of an object

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C

It is the quantity that expresses the extent of a planar 2-D surface

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D

It is the height of an object

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Solution

## The correct option is C It is the quantity that expresses the extent of a planar 2-D surface The first thing that needs to be understood is that area is a 2 dimensional quantity. Area is the quantity that expresses the extent of a two-dimensional figure or shape, or planar lamina, in the plane. It is only possible to measure area for 2-D surfaces. There is a different quantity to deal with areas for 3-D surfaces which we will look at slightly later in the upcoming questions. Examples of 2-D surfaces are rectangles, circles, ellipse etc. It is possible to find area for all these 2-D surfaces. But area of objects such as cubes, cylinders, spheres etc. are not defined. But intuitively we know that there is some area associated with such 3-D objects. How come? The answer is coming soon!

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