Geometric shapes: 2-dimensional

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

List of shapes



Polygon A closed figure made of line segments each of which intersects with exactly two other line segments.
outline of an irregular polygon
Quadrilateral 4-sided polygon
outline of a 4-sided polygon
Square A quadrilateral having all sides equal in length and forming right angles.
outline of a square
Triangle A 3-sided polygon (sum of internal angles = 180°)
outline of a triangle
Rectangle A 4-sided polygon with all right angles.
outline of a rectangle
Parallelogram 4-sided polygon with two pairs of parallel sides.
outline of a parallelogram
Pentagon 5-sided polygon (the graphic shows a regular hexagon with "regular" meaning each of the sides are equal in length)
outline of a pentagon
Hexagon 6-sided polygon
outline of a hexagon
Heptagon 7-sided polygon
outline of a heptagon
Octagon 8-sided polygon
outline of an octagon
Note: Use this printable graph paper generator to create grids that can help when drawing shapes.

More Math Help

All Geometry 24 Worksheets Terms/ Definitions Formulas/ Equations 2D Shapes Defining Attributes 3D Shapes Quadrilaterals Measuring Angles Using a Protractor Adding and Subtracting Angles Angle Properties Finding Angles Symmetry Area Volume Surface Area Perimeter Coordinate System Coordinate Graphing Pythagoras' Theorem Distance Between Two Points Congruent Triangles Similar Triangles Transformations Dilations