CD and FG are the same length. AD and EF are the same length. Image caption, Angles in congruent shapes are equal. Angle A and angle E are equal. They correspond to each other. Angle B and angle H ...

This means that this triangle is equilateral. You can also describe the angles as congruent – they are exactly the same size. This triangle has 2 equal angles, each measuring 75º. An isosceles ...