CBSE Class 10 Introduction to Trigonometry Important Formulas and concepts for exams

CBSE Class 10 Introduction to Trigonometry Important Formulas and concepts for exams. There are many more useful educational material which the students can download in pdf format and use them for studies. Study material like concept maps, important and sure shot question banks, quick to learn flash cards, flow charts, mind maps, teacher notes, important formulas, past examinations question bank, important concepts taught by teachers. Students can download these useful educational material free and use them to get better marks in examinations.  Also refer to other worksheets for the same chapter and other subjects too. Use them for better understanding of the subjects.

The word ‘trigonometry’ is derived from the Greek words ‘tri’ (meaning three), ‘gon’ (meaning sides) and ‘metron’ (meaning measure). In fact, trigonometry is the study of relationships between the sides and angles of a triangle.

Trigonometric Ratios (T - Ratios) of an acute angle of a right triangle

In XOY-plane, let a revolving line OP starting from OX, trace out <XOP=q. 

From P (x, y)draw PM ↓ to OX. In right angled triangle OMP. OM = x (Adjacent side); PM = y (opposite side); OP = r (hypotenuse).

* Remark 1 : sin q is read as the “sine of angle q” and it should never be interpreted as the product of ‘sin’ and ‘q’

* Remark 2 : Notation : (sin q) 2 is written as sin2 q (read “sin square q’’) Similarly (sin q) n  is written as sinn q (read ‘‘sin nth power q’’ ), n being a positive integer.

* Note : (sin q) 2 should not be written as sin q2 or as sin2 q2

* Remark 3 : Trigonometric ratios depend only on the value of q and are independent of the lengths of the sides of the right angled triangle. 

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