Chapter 6 (Samacheer Kalvi) · Class 9 TN Board · Formula Sheet

Trigonometry (முக்கோணவியல்) Formulas — Class 9 TN Board

Trigonometric ratios, standard angles, complementary angles, and identities.

Detailed formula cards for Trigonometry (முக்கோணவியல்) are being prepared. Meanwhile, practice questions to master this topic.

Start Practising

Worked Examples

1Using: sin 30

Find sin 30 + cos 60.

Step 1: sin 30 = 1/2, cos 60 = 1/2.

Step 2: Sum = 1/2 + 1/2 = 1.

Answer: 1

2Using: tan identity

If tan A = 3/4, find sin A.

Step 1: In right triangle: opposite = 3, adjacent = 4.

Step 2: hypotenuse = 5. sin A = 3/5.

Answer: 3/5

Practice Now

Apply these formulas with 60+ practice questions and AI-powered doubt clearing.

Practice Now

More Class 9 TN Board Formulas

Set Language (கணமொழி)Real Numbers (மெய்யெண்கள்)Algebra (இயற்கணிதம்)Geometry (வடிவியல்)Coordinate Geometry (ஆயத்தொலை வடிவியல்)Mensuration (அளவியல்)

Frequently Asked Questions

How many formulas are in Class 9 TN Board Trigonometry (முக்கோணவியல்)?+
There are several key formulas in the Trigonometry (முக்கோணவியல்) chapter for Class 9 TN Board. Each formula is essential for solving problems in this topic.
How to remember Trigonometry (முக்கோணவியல்) formulas easily?+
Practice regularly with worked examples, group related formulas together, and use SparkEd's interactive practice mode to reinforce your memory through problem-solving.
Are these Trigonometry (முக்கோணவியல்) formulas enough for exams?+
Yes, these formulas cover the complete TN Board Class 9 syllabus for Trigonometry (முக்கோணவியல்). Practice applying them to different types of questions for full exam readiness.

Master Trigonometry (முக்கோணவியல்) on SparkEd

Go beyond formulas. Practice at three difficulty levels with instant feedback, step-by-step solutions, and an AI coach.

Start Practising Free

SparkEd Maths provides free formula sheets for Class 1-10 across 7 education boards. All formulas are aligned to the 2025-26 syllabus.