Trigonometrical Ratios
ICSE · Class 9 · Mathematics
All formulas from Trigonometrical Ratios in ICSE Class 9 Mathematics. Key equations, constants, and identities for board exam preparation.
Interactive on Super Tutor
Studying Trigonometrical Ratios? Get the full interactive chapter.
Quizzes, flashcards, AI doubt-solver and a step-by-step study plan — built for formula sheet and more.
1,000+ Class 9 students started this chapter today
Super Tutor has 5+ illustrations like this for Trigonometrical Ratios alone — flashcards, concept maps, and step-by-step visuals.
See them allFormulas
Six Trigonometrical Ratios
sin A = perpendicular / hypotenuse = BC/AC
cos A = base / hypotenuse = AB/AC
tan A = perpendicular / base = BC/AB
cot A = base / perpendicular = AB/BC
sec A = hypotenuse / base = AC/AB
Pythagoras and Finding Missing Sides
AC^2 = AB^2 + BC^2
Reciprocal and Quotient Identities
sin A = 1/cosec A
cos A = 1/sec A
tan A = 1/cot A
tan A = sin A / cos A
cot A = cos A / sin A
Full sheet with units and worked examples
View AllFrequently Asked Questions
What are the important topics in Trigonometrical Ratios for ICSE Class 9 Mathematics?
How to score full marks in Trigonometrical Ratios — ICSE Class 9 Mathematics?
Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
More resources for Trigonometrical Ratios
Practice Quiz
Test yourself with a quick quiz
Important Questions
Practice with board exam-style questions
Revision Notes
Key points for last-minute revision
Chapter Summary
Understand the chapter at a glance
Concept Maps
See how topics connect visually
Study Plan
Step-by-step plan to ace this chapter
Flashcards
Quick-fire cards for active recall
Syllabus
What topics to cover
NCERT Solutions
Every textbook question solved step by step
For serious students
Get the full Trigonometrical Ratios chapter — for free.
Quizzes, flashcards, AI doubt-solver and a step-by-step study plan for ICSE Class 9 Mathematics.