Answer:A triangle can be defined as a two-dimensional shape that comprises three (3) sides, three (3) vertices and three (3) angles.
This ultimately implies that, any polygon with three (3) lengths of sides is a triangle.
In Geometry, there are three (3) main types of triangle based on the length of their sides and these are;
Equilateral triangle.
Scalene triangle.
Isosceles triangle.
An isosceles triangle has two (2) congruent sides that are equal in length and two (2) equal angles while the third side has a different length.
Explanation: