ορθογώνιο παραλληλόγραμμο 用英语:

Show students how to combine rectangles and triangles to create houses.

The opposite sides of a rectangle are parallel.

A square is always a rectangle, but a rectangle is not always a square.

A square is one type of rectangle.

Every square is a rectangle. A rectangle has four right angles.

rectangle - a shape with four sides and four angles of 90 degree