The shapes shown below may be useful reminders to you as you help with your child’s geometry homework. Each geometry shape includes a brief description and an illustrated example.
Shape 
Description 

Polygon  A closed figure made of line segments each of which intersects with exactly two other line segments.  
Quadrilateral  4sided polygon  
Square  A quadrilateral having all sides equal in length and forming right angles.  
Triangle  A 3sided polygon (sum of internal angles = 180°)  
Rectangle  A 4sided polygon with all right angles. 
Parallelogram  4sided polygon with two pairs of parallel sides.  
Pentagon  5sided polygon (the graphic shows a regular hexagon with "regular" meaning each of the sides are equal in length)  
Hexagon  6sided polygon  
Heptagon  7sided polygon  
Octagon  8sided polygon 
More Math Help
There are more geometry definitions included in this section.