Right-Angled Triangle
The side opposite to the largest angle of a triangle is the largest side
polygon
Any exterior angle of the triangle is equal to the sum of its interior opposite angles
has three sides
has three angles
Isosceles Triangle
Obtuse Angled Triangle
Acute Angled Triangle
The sum of the length of any two sides of a triangle is greater than the length of the third side
Equilateral Triangle
has three vertices
Scalene Triangle
The sum of all internal angles of a triangle is always equal to 180°