Course Content
Theme 01: Number System.
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Theme 02: Integers.
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Theme 03: Sets
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Theme 04: Fractions
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Theme 05: Decimals.
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Theme 06: Factors and Multiples.
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Theme 07: Ratio and Proportion.
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Theme 08: Percentage, Speed, Distance and Time.
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Theme 09: Algebraic Expressions And Linear Equation.
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Theme 10: Fundamental Concepts of Geometry.
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Theme 11: Angles.
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Theme 12: Triangles.
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Theme 13: Circle And Quadrilaterals.
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Theme 14: Constructions.
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Theme 15: Symmetry.
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Theme 16: Perimeter and Area.
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Theme 17: Statistics.
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Mathematics – 6
About Lesson

For a summary on triangles in Class 6 ICSE Maths, we’ll cover the basic concepts:

 

1. **Definition of a Triangle**: A triangle is a closed figure with three sides.

 

2. **Types of Triangles**: Triangles can be classified based on sides and angles:

   – Based on sides:

     – Scalene Triangle: All sides are of different lengths.

     – Isosceles Triangle: Two sides are of equal length.

     – Equilateral Triangle: All sides are of equal length.

   – Based on angles:

     – Acute-angled Triangle: All angles are less than 90 degrees.

     – Right-angled Triangle: One angle is 90 degrees.

     – Obtuse-angled Triangle: One angle is greater than 90 degrees.

 

3. **Properties of Triangles**:

   – The sum of angles in a triangle is always 180 degrees.

   – The exterior angle of a triangle is equal to the sum of the two interior opposite angles.

   – The sum of the lengths of any two sides of a triangle is greater than the length of the third side.

 

4. **Pythagorean Theorem**: In a right-angled triangle, the square of the length of the hypotenuse is equal to the sum of the squares of the lengths of the other two sides.

 

5. **Area of a Triangle**: The area of a triangle is given by the formula A = 1/2 × base × height, where base and height are perpendicular to each other.

 

6. **Similarity of Triangles**: Two triangles are similar if their corresponding angles are equal and their corresponding sides are in proportion.

 

This summary covers the basics of triangles in Class 6 ICSE Maths.