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.
1 A rectangle is a parallelogram that has four opposite, parallel, congruent sides. 2  The corners of the rectangle form a right angle. 3  The only difference between a rectangle and a square is that the rectangles sides are not all equal. 4  A rhombus has four equal sides. The opposite sides are parallel and all corners of the square form a right angle. 2  A rectangle is a parallelogram that has four opposite, parallel, congruent sides. 3  The corners of the rectangle form a right angle. 4  The only difference between a rectangle and a square is that the rectangles sides are not all equal.