A triangle is a plane figure with three straight sides and three angles. The sum of angles of a triangle is equal to 180 degrees and the exterior angles of a triangle are always equal to 360 degrees. In a triangle, the sum of the angles is always greater than the length of the third angle. The area of a triangle is given by the formulae:
½ * base * height.
A triangle is classified into different types based on their sides and angles.
- Equilateral Triangle
- Isosceles triangle
- Scalene Triangle
- Acute angled Triangle
- Right angle Triangle
- Obtuse-angled Triangle
Details about Chapter 7 of Class 9 Maths are given below:
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