For example a pentagon is always a shape that has 5 sides. 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.

When transforming a shape, either through translation ... DF ÷ AC = 12 ÷ 4 = 3. This means triangles ABC and DEF are not similar. Angle A and angle D are equal. Angle B and angle E are equal.