direct method and indirect method

Constructing each interior angle = 108 o Exterior angle of a regular pentagon each interior angle = 180 o - 72 o = 108 o (i) Draw AB = 4 cm. (ii) using a protractor, make ABX = B AY = 108 o (iii) Cut BX and AY at C and E respectively, so that BC = AE = 4 cm. (iv) With centres C ..

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Let a be the smaller positive angle with cos a = k. Then, cos(- a ) = k cos q = cos a and cos (- a ) A = q or - a Also, any co-terminal angle with above is trigonometrically equivalent and so has the same cosine. q = (Any even multiple of p )+ a or (Any even multiple of ..

Fractional distillation in a fractionating colum..

There are basically two types of reproduction - asexual and sexual. This classification is based on the number of parents. Asexual reproduction involves only one parent and the offspring is genetically similar to the parent. Sexual reproduction involves two parents and the offspring has a fusion o..

It involves the intake of synthetic hormones by the females to prevent ovulation. These are called oral contraceptive pills and have to be taken as per doctor's advic..

The symbols and formulae of the reactant and products are written as a skeletal equation. Any elementary gas (O 2 , H 2 , N 2 etc.) appearing on either side of the skeletal equation, is written in the atomic state. The formula containing the maximum number of atoms is selected to begin the..

For determination of the order of a reaction, following methods are usually employed. a) Graphical Method b) Initial Rate Method c) Ostwald Method of Isolatio..

This method is also known as tabular method. In this method, a set is represented by listing all the elements of the set, the elements being separated by commas and are enclosed within flower brackets {..

When equations contain many reactants and products they cannot be balanced by the hit and trial method. They are then balanced by the partial equation method. In this method the overall reaction is assumed to take place through two or more simpler reactions, which can..