1598 Spanish Colonization of New Mexico Juan de OÃ±ate leads the Spanish colonization of the province of New Mexico. He establishes his first capital in San Juan de los Caballeros at the confluence of the Rio Grande and Chama River. Read More.
1 An equilateral triangle has all its angles measuring 60Â°. So, the angles of an equilateral triangle are Congruent Angles.  A square and a rectangle have all their angles measuring 90Â°. So, the angles of a square and a rectangle are Congruent Angles.
Recall that in order for lines or angles to be congruent, they had to have equal measures. In that same way, congruent triangles are triangles with corresponding sides and angles that are congruent, giving them the same size and shape. Because side and angle correspondence is important, we have to be careful with the way we name triangles.