a 90 degree angle
right angle
a triangle with all sides and angles equal
equilateral triangle
A triangle having three unequal sides and angles.
scalene triangle
The intersection point of two sides of a plane figure.
vertex
A triangle with one internal angle equal to 90 degrees
right triangle
A polygon with 5 sides and 5 angles
pentagon
A rectangle having all four sides of equal length
square
An angle less than 90 degrees but greater than 0 degrees
acute angle
The line segment between two points on a given curve
chord
One part of a line
line segment
A continuous extent of length
line
A position in space
point
Line segments that do not intersect
parallel line segments
A polygon with four sides
quadrilateral
A polygon having eight angles and eight sides
octagon
A triangle which has two sides equal
isosceles triangle
A polygon having six sides and six angles
hexagon
An angle greater than 90 degrees but less than 180 degrees
obtuse angle
A curve that is continuous and has endpoints that meet at the same point
closed circle
A quadrilateral plane figure having two parallel and two nonparallel sides
trapezoid