User:Weux082690/Draft of List of common geometric figures

The following is a list of the most commonly encountered shapes with pictures and names for each.

Triangles

A list of different types of triangles, all of which have three sides and three angles.

Name	Definition	Picture	Seen in
Equilateral triangle	Three equal sides and three equal angles.
Isosceles triangle	Two equal sides and two equal angles.
Right triangle	One angle is a right angle (90 degrees or pi/2 radians)		Building construction
Scalene triangle	Not equilateral or isosceles

Quadrilaterals

A list of quadrilaterals, which have four sides and four angles.

Name	Definition	Picture	Seen in
Square	All four sides are equal length. All four angles are equal (90 degrees or pi/2 radians)
Rectangle	All four angles are equal (90 degrees or pi/2 radians). Each pair of opposite sides are equal, i.e., if the sides are numbered clockwise: 1,2,3,4, then 1 & 3 would be equal and 2 & 4 would be equal.		Pieces of paper, doorways, most signs, etc. The most common shape in the modern world.

Higher Polygons

Shapes with more sides than four.

Name	Definition	Picture	Seen in
Hexagon	Six sides and six angles		Pencil cross sections, honeycombs
Octagon	Eight sides and eight angles		Stop signs

Curves

Shapes not made up of straight lines.

Name	Definition	Picture	Seen in
Circle	Perfectly round. All points same distance from center.		Coins, CDs, etc.
Oval