A square has four corners, which are also referred to as vertices. At each of the four corners of a square, two perpendicular lines meet to form a right angle. A square contains a total of 360 interior degrees.

A square is a quadrilateral, a four-sided figure with each side measuring the same length. The two pairs of opposite sides are parallel to one another. Drawing a line from the bottom left corner to the top right corner or the bottom right corner to the top left corner divides the square into two equilateral triangles, each with two 45-degree angles and one 90-degree angle.