Triangle

Triangle:

      In gementry, a triangle is a three- side polygon that consists of three edges and three vertices.

Types of triangle:

        Based on Sides

        Based on Angles

   Based on sides,

        Scalene triangle,

        Isosceles triangle,

        Equilateral triangle.

   Based on Angles,

         Acute angle,

        Right angle,

       Obtuse - angle.

Scalene triangle:

     All the sides and angles are unequal.

Example:

Isosceles triangle:

      It has two equal sides. Also, the angles opposite these equal side are equal.

Example: 

Equilateral triangle:

     All side are equal and all the three angles are equal 60°.

Example:

Acute Angle triangle:

      A triangle having all, its angles less than 90°.

Example:

Right Angle triangle:

     A triangle having one of the three angles exactly 90°

Example:

Obtuse - Angle triangle:

 

Example:

Formula: