First, here's an isosceles triangle, it has two equal length sides and two equal angles. Oh! Very clever! Now we have an equilateral triangle. Three sides of equal length andall the angles are 60 ...

An equilateral triangle has 3 sides of equal length. The dashes on the lines show they are equal in length. All of the angles are also equal. An isosceles triangle has 2 sides of equal length.