Skip to main content
Super TutorResources
Chapter 22 of 26
Revision Notes

Introduction To Trigonometry — Revision Notes

NIOS · Class 10 · Maths

Introduction To Trigonometry revision notes for NIOS Class 10 Maths: 4 topics in quick points. Part of the NIOS Class 10 Maths syllabus.

42 questions24 flashcards8 formulas & key relations5 concepts

Interactive on Super Tutor

Studying Introduction To Trigonometry? Get the full interactive chapter.

Quizzes, flashcards, AI doubt-solver and a step-by-step study plan — built for revision notes and more.

Try Super Tutor — Free

Free trial, no card needed.

An illustration showing various real-life scenarios where trigonometry is used, such as finding the height of a tree, the height of a kite, the width of a river, or the distance an aeroplane has trave
Super Tutor

Learn better with visuals Super Tutor pairs illustrations like this with notes and quizzes for Introduction To Trigonometry.

Key Topics to Revise

1

1. Trigonometric Ratios in a Right Triangle

  • In right triangle ABC right-angled at B, AC is the hypotenuse.
  • For angle A = theta, BC is the side opposite to angle A and AB is the side adjacent to angle A.
  • The six trigonometric ratios are sin theta, cos theta, tan theta, cosec theta, sec theta, and cot theta.
2

2. Finding Ratios from Given Sides

  • When two sides of a right triangle are known, use Pythagoras Theorem to find the third side first.
  • After finding the third side, substitute the values into the trigonometric ratio formulas.
  • This method is used in many direct question types.
3

3. Relations Among Trigonometric Ratios and Standard Values

  • tan theta equals sin theta divided by cos theta.
  • cot theta equals cos theta divided by sin theta and also 1/tan theta.
  • sec theta equals 1/cos theta.
4

4. Trigonometric Identities

  • An equation is true for some values of the variable.
  • An identity is true for all values of the variable.
  • The three fundamental trigonometric identities are central to the chapter.

Get complete notes with diagrams and examples

Full Notes

Key Concepts

In a right triangleThe six ratios are sin thetaEvery trigonometric ratio is a realsin theta and cosec thetaIn a right triangle with sides

Frequently Asked Questions

What are the important topics in Introduction To Trigonometry for NIOS Class 10 Maths?
Key topics in Introduction To Trigonometry include Trigonometric Ratios in a Right Triangle, Finding Ratios from Given Sides, Relations Among Trigonometric Ratios and Standard Values, Trigonometric Identities. Study these first, then practise questions on each for the NIOS Class 10 board exam.
How should I revise Introduction To Trigonometry for the NIOS Class 10 board exam?
Learn the core ideas first, then work through the 42 practice questions on Introduction To Trigonometry. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

More resources for Introduction To Trigonometry

All NIOS Class 10 Maths Revision Notes

For serious students

Get the full Introduction To Trigonometry chapter — start free.

Quizzes, flashcards, an AI doubt solver and a study plan for NIOS Class 10 Maths. Free to start, no card needed.

Try Super Tutor Free
Try this chapter free