A square is created by four lines of equal measurements that create a right angle where the lines meet. It has four sides.
A circle is made up of one 360-degree curve. Without any line segments, the circle lacks any angles at all.
Triangles, which consist of three line segments, can contain various length lines. The type of triangle is determined by the angles created where the line segments meet. Triangles don't always contain right angles. If all the angles measure less than 90 degrees, the triangle is considered acute.Learn more about Shapes