ncert solutions for class 9 maths chapter 7 pdf

A triangle has three sides and three angles. The three angles always add to 180 degree. There are three special names given to triangles that tell how many sides (or angles) are equal.

There can be 3, 2 or no equal sides/angles:

Equilateral

• Three equal sides
• Threeequal angles, always 60°

Isosceles

• Two equal sides
• Two equal angles

Scalene

• No equal sides
• No equal angles

Type of Angle

Triangles […]