Subject: Optional Mathematics

The following three systems are commonly used in the measurement of angles: a) Sexagesimal system (degree system): This system is also called British System. In this system, the unit of measurement is degree. So, this system is also known as degree system. b) Centesimal system (grade system): This system of measurement is also called the French system. In this system, the unit measurement is grade.So this system is also known as grade system

Learn MoreLet us consider a right-angled triangle ABC in which ∠ABC = 90°. This triangle consists of a right angle, two acute angles and three sides. These are called elements of a right-angled triangle. One of the acute angles is considered as the reference angle. This reference angle is used for naming the sides of a right-angled triangle. The side opposite to the reference angle is called perpendicular and it is denoted by the letter p. This side opposite to the right angle is called hypotenuse and it is denoted b

Learn MoreDifferent standard angles are taken as a variable in the trigonometric function. For different angles, the values of trigonometric ratios will also be different. Take the angles of x-axis and values of trigonometric ratios in y-axis Join the points freely to obtain the graph of the trigonometrical ratio.

Learn MoreDifferent angles have a different value with various trigonometric ratios. We shall consider 0°, 30°, 45° and 90° as the standard angles and we shall learn their values here. In this unit, we shall verify the values of 0°, 30°, 45° and 90° using geometrical proofs. Different angles have a different value with various trigonometric ratios. We shall consider 0°, 30°, 45° and 90° as the standard angles and we shall learn their values here. In this unit, we shall verify the values of 0°, 30°, 45° and 90° using geometrical proofs.

Learn MoreThis note includes all the information of Trigonometrical ratios of angle generalized and associated with a given angle theta.

Learn MoreAny allied angle can be in the form (n × 90° ± \(\theta\)) where n is an integer. We can change the trigonometric ratios of the angle (n × 90° ± \(\theta\)) into the trigonometric ratio of an angle \(\theta\).

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