basic mathematical shapes

here are some basic math shapes. 

Circle 

A circle is a round, two dimensional shape that looks similar to the letter 'O'. In strict mathematical language, circle refers to the boundary of the shape while 'disk' is used to refer to the whole shape, including the inside. A straight line from the center of a circle to the edge is called the radius. https://www.kidsmathgamesonline.com

Pentagon

A pentagon is a 5 sided polygon with interior angles that add to 540 degrees. Regular pentagons have sides of equal length and interior angles of 108 degrees.  https://www.kidsmathgamesonline.com

Triangle 

The sum of all the internal angles of a triangle is always 180o no matter how the triangle is constructed.A triangle can always be split into two right triangles no matter how the triangle is constructed. https://www.smartconversion.com A triangle has 3 sides and 3 angles.

Octagon

An octagon has 8 exterior angles. The sum of the exterior angles of an octagon is 360°. Regular octagon: An octagon in which all sides and angles are equal. Each angle of a regular octagon is 135°.

Square

a square is a shape with four sides that are equal to each other and four 90 degrees angles.

Hexagon

A hexagon is a polygon with 6 sides and 6 corners (vertices). Like regular triangles and squares, hexagons fit together without gaps, which are known as tesselations. They therefore are often used for tiling floors. They are also quite common in nature. https://kids.kiddle.co