Formulae and Their Uses

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A formula is an equation that establishes a relationship among the variables involved in it. The subject of a formula is a variable that is expressed in terms of the other variables. The subject of a formula always lies on the left hand side of the equality sign. The coefficient of the subject of a formula is always one. The subject of a formula does not link with any other quantities. Finding the value of the subject by substituting the values of the other variables is called the evaluation of the subject of a formula. Formulae are used to calculate perimeters, areas of closed figures, volumes of solid objects, and so on.

Questions & Answers

1 . what is formula give some example
formula is estabilshing the relation among varabiles and constant involve in it i think so.....
3 . What are the lenghts of the sides of the rectangle?
Sol: Let the breadth of the rectanle be 'x' cm Length of the rectangle = (x + 20) cm Perimeter of the rectagle = 2(l + b) = 2(x + x + 2...
4 . Find the present ages of the father and his son.
Sol: Let the present age of the son be x years. Age of the father = 5x years Age of the son after 10 years = (x + 10) years Age of the ...
5 . What is the income of Ramesh?
Sol: Let the income of Ramesh be Rs x. Part of the income given to son = x/3 Part of the income given to daughter = x/4 Part of the inc...