A circle is a 2D geometric shape consisting of all points that are at an equal distance from a central point called the center. This distance is known as the radius of the circle.… 展开

A square is a four-sided polygon with all sides equal in length with all four angles being right (i.e. they equal 90 degrees). Is a square also a rectangle? 展开

A rectangle is a four-sided polygon with opposite sides that are parallel to each other and equal in length. All four interior angles of a rectangle are equal to 90 degrees.… 展开

The 2D geometric shape known as a regular pentagon is a five-sided polygon where all of the sides and all of the angles are equal in measure. 展开