Posted by Aman Sir | Maths Vidya Institute
🎥 Watch the complete video here:
Trigonometry is one of the most important concepts you’ll learn in Class 10 CBSE Maths. It teaches how angles and sides of a right triangle relate to each other. This chapter forms the base for Class 11, Class 12, and even science and engineering courses.
🔍 What is Trigonometry?
Trigonometry is the study of triangles — more specifically, the relationships between the angles and sides of right-angled triangles. It’s introduced in Chapter 8 of the Class 10 NCERT Maths book.
The word “Trigonometry” comes from Greek:
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“Tri” = Three
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“Gono” = Sides
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“Metron” = Measure
So, it literally means measuring triangles.
🔺 Understanding the Triangle Setup
Before diving into formulas, understand these 3 sides of a right-angled triangle:
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Hypotenuse: The longest side, always opposite the right angle
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Perpendicular: The side opposite to the angle in question
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Base (Adjacent): The side next to the angle (excluding the hypotenuse)
These definitions help you understand which trigonometric ratio to use.
✏️ Trigonometric Ratios (The Core of Chapter 8)
These are formulas that show how the sides relate to each other depending on the angle:
| Trigonometric Ratio | Formula |
|---|---|
| sin θ | Perpendicular / Hypotenuse |
| cos θ | Base / Hypotenuse |
| tan θ | Perpendicular / Base |
| cosec θ | 1 / sin θ |
| sec θ | 1 / cos θ |
| cot θ | 1 / tan θ |
These ratios apply only in right-angled triangles.
🎯 Real-Life Applications of Trigonometry
You might wonder: why learn this?
Here’s where Trigonometry is used in real life:
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Measuring height of buildings and mountains
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Engineering and architecture designs
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Navigation systems like GPS
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Physics and astronomy calculations
🧠 Tips to Master This Chapter
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Visualize the triangle always before applying any formula
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Label sides clearly based on the angle you’re dealing with
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Make a quick reference chart of all ratios
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Practice NCERT examples and previous year board questions
🔗 What’s in the Video
In the YouTube lecture, Aman Sir explains:
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Triangle side definitions
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Introduction of trigonometric ratios
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NCERT-based explanation
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The video is perfect for both first-time learners and those revising before exams.
🎥 Watch now: https://youtu.be/O_RNACzXJcg
👨🏫 About Aman Sir
Aman Sir, founder of Maths Vidya Institute, has over 14 years of experience teaching CBSE Maths. His teaching style focuses on concept clarity and real exam tricks. Many students follow his videos and notes for scoring 90+ in Class 10 and 12 Maths.
