An equilateral triangle is a triangle in which all three sides are of equal length. In other words, all three sides are congruent. Additionally, all three angles in an equilateral triangle are equal and measure 60 degrees. The equilateral triangle is a special case of an isosceles triangle.
An isosceles triangle is a triangle in which two sides are of equal length. The angles opposite the equal sides are also equal. The remaining side, called the base, is typically of a different length. The base angles, which are the angles formed by the base and the equal sides, are congruent. In an isosceles triangle, the sum of the angles always adds up to 180 degrees.
A scalene triangle is a triangle in which all three sides have different lengths. Additionally, all three angles in a scalene triangle are different. There are no congruent sides or angles in a scalene triangle
A right-angled triangle is a triangle that contains a right angle, which measures 90 degrees. The side opposite the right angle is called the hypotenuse, and the other two sides are called the legs. The Pythagorean theorem, which states that the square of the hypotenuse is equal to the sum of the squares of the legs, applies to right-angled triangles.
All those points which exist on the same line