- Meaning and Importance of Trigonometry
- Problem 1: Meaning and Importance of Trigonometry
- Solving Right-Angled Triangles Using Trigonometrical Ratios
- Concept of Angle of Elevation & Depression
- Problem 1: Concept of Angle of Elevation & Depression
- Engineering and Heights and Distances
- More on Engineering and Heights and Distances
- Problem1-Engineering and Heights and Distances
- Problem2-Engineering and Heights and Distances
- when one Side & Angle of Elevation are Given
- Problem-When one Side & Angle of Elevation are Given
- Problem 2: when one Side & Angle of Elevation are Given
- when One Side & Angle of Depression are Given
- Problem 1: when One Side & Angle of Depression are Given
- Problem2-when One Side & Angle of Depression are Given
- when Hypotenuse & Angle of Elevation are Given
- Problem 1: when Hypotenuse & Angle of Elevation are Given
- when Given Sides-Angle of Elevation-Depression
- Problem 1: when Given Sides-Angle of Elevation-Depression
- Problem 2: when Given Sides-Angle of Elevation-Depression
- More Examples on Application of Trigonometry
- Concept of Oblique Triangles
- Problem-Concept of Oblique Triangles
- The Cosine Rule
- More on The Cosine Rule
- Problem1-The Cosine Rule
- Problem2-The Cosine Rule
- The Sine Rule
- Problem-The Sine Rule
- Examples on Sine Rule
- Application of the Sine Rule
- The Law of Tangents
- More on The Law of Tangents
- Problem-The Law of Tangents
- Half Angle Formulas
- Problem-The Sine of Half the Angle Formula
- The Cosine of Half the Angle in Terms of the Sides
- Problem-The Cosine of Half the Angle in Terms of the Sides
- The Tangents of Half the Angle in Terms of the Sides
- Problem-The Tangents of Half the Angle in Terms of the Sides
- When Measures of One Side and Two Angles are Given
- Problem-When Measures of One Side and Two Angles are Given
- When Measures of Two Side and Their Included Angles are Given
- Problem-When Measures of Two Side and Their Included Angles are Given
- When Measures of Three Sides are Given

- Area of Triangle
- Area of Triangle by Measuring One Side and Two Angle
- Area of Triangle by Measuring Three Sides
- Problem-Area of Eqilateral Triangle With Given Sides
- Area of Equilateral Triangle with Given Sides
- More on Area of a Triangle with Given Sides
- Area of Triangle by Heros Formula

- Circles Connected With Triangles
- Problem-Circles Connected With Triangles
- Relation Among Radius, Circum-Angle & Chord of a Circum-Circle
- More on Relation Among Radius, Circum-Angle & Chord of a Circum-Circle
- Problem1-Relation Among Radius, Circum-Angle & Chord of a Circum-Circ
- Relation Among In-Radius, Perimeter & Area of Triangle
- Problem-Relation Among In-Radius, Perimeter & Area of Triangle
- Relation Among ex-Radius, Perimeter & Area of Triangle
- Problem-Relation Among ex-Radius, Perimeter & Area of Triangle
- Engineering and Circles Connected With Triangles
- Problem-Engineering and Circles Connected With Triangles