### Video Transcript

Is this an equilateral, an
isosceles, or a scalene triangle?

In this question, we’re shown a
triangle, and we have to identify which type of triangle it is. Is this an equilateral
triangle? An equilateral has three equal
sides. All of its sides are equal in
length. The given triangle has two sides
equal in length. So, we know it’s not an equilateral
triangle. Is it an isosceles triangle? We know that isosceles triangles
have two sides which are equal in length. The given triangle is an isosceles
triangle. We know it’s not a scalene triangle
because scalene triangles have three sides all different in length. This triangle is an isosceles
triangle. We know this because two of its
sides are equal in length.