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Examples:, , (i) The perimeter P of a square of, side S is given by the formula, P = 4 x, SS, , Here 4 is a constant while P and S, are variables., , (ii) The circumference C of a circle of, radius R is given by the formula, C =, 2nR, , Here 2 and m1 are constants while C, and R are variables., , Terms Of An Algebraic Expression:, The different parts of the algebraic, expression separated by the sign, , + or -, are called the terms of the, expression., , Examples:, , (i) 5 - 3x + 4 x?y is an algebraic, expression consisting of three terms,, namely 5, -3x and 4x?y., , (ii) 7x? -5xy + y? z — 8 is an algebraic, expression consisting of four terms,, namely 7x?, -5xy, y? z and -8.