Finding the perimeter of a rectangle is an essential skill that many students learn early in their mathematical education. The perimeter is the total length of all sides of a geometric figure and can ...

An angle is the space between two lines that start at the same point. This point is called the vertex. Angles measure the size of a turn in degrees. You can show degrees using the symbol ° after the ...

Two-dimensional (2D) shapes are completely flat. They have two dimensions – length and width. A polygon is a closed 2D shape with straight sides that meet at vertices. Polygons can be regular or ...