Question

how to prove that a triangle is an equilateral traingle and isosceles triangle​

Answer 1

Answer:

Let's discuss the properties of Equilateral Triangle.

The Equilateral Triangle has 3 equal sides.

The Equilateral Triangle has 3 equal angles.

The total sum of the interior angles of a triangle is 180 degrees, therefore, every angle of an equilateral triangle is 60 degrees.

It is a 3 sided regular polygon.

If a triangle has two congruent angles, then the sides opposite those angles are congruent. In other words, iso-angular triangles are iso-lateral (isosceles). This is the converse of the isosceles triangle theorem.