Basics
Polygon
A closed plane figure with line segments
Pentagon
a polygon with 5 sides
Equilateral Triangle
A triangle with all equal sides
Right angle
a 90 degree angle
Parallelogram
A quadrilateral with both pairs of opposite sides parallel and equal
Regular Polygon
Has sides of equal length and angles of equal measure
Hexagon
a polygon with 6 sides
Isosceles Triangle
A triangle with two equal sides
acute triangle
a triangle with 3 acute angles
Trapezoid
Quadrilateral with only one set of parallel sides
Triangle
Octagon
polygon with 8 sides
Scalene Triangle
A triangle with no equal sides
Right Triangle
A triangle with a right angle
Rhombus
A quadrilateral with parallel sides and all sides equal in length
Quadrilateral
a polygon with 4 sides
Vertex (vertices)
A point where the sides meet at a polygon
Obtuse angle
an angle that is larger than 90 degrees
Obtuse Triangle
A triangle with an obtuse angle
Rectangle
A parallelogram with 4 right angles
Side
each line segment of a polygon
Attribute
a characteristic of a shape
Acute angle
An angle that is less than 90 degrees
Square
A rectangle with all sides equal
Parallel sides
sides of a polygon that are the same distance apart at every point