what is meant by variable and constant

Hi Adeeb!
 
A variable can take different values whereas a constant has a fixed value. For example, the lengths of an equilateral triangle can have any values. Therefore, length of an equilateral triangle is a variable. The number of sides of a hexagon is 6, which is fixed. Therefore, the number of sides of a hexagon is a constant. The letters, l, m, n, p, x, y, z, etc., are used to denote variables.
 
Cheers!

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variable can take different values wheras a constant has a fixed value

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