Angles
a 90 degree angle
Right Angle
a closed plane curve consisting of all points at a given distance from a point within it called the center
Circle
a quadrilateral having both pairs of opposite sides parallel to each other
Parallelogram
a continuous extent of length
Line
a closed plane curve consisting of all points at a given distance from a point within it called the center
circle
an angle less than 90 degrees but greater than 0 degrees
Acute Angle
a polygon with four sides
Quadrilateral
a parallelogram having four right angles
Rectangle
one part of a line
Line Segment
a straight line passing through the center of a circle or sphere and meeting the circumference or surface at each end
Diameter
an angle greater than 90 degrees but less than 180 degrees
Obtuse Angle
a polygon having six sides and six angles
Hexagon
a rectangle having all four sides of equal length
Square
the part of a straight line considered as originating at a point on the line and as extending in one direction from that point
Ray
a straight line extending from the center of a circle or sphere to the circumference or surface
Radius
the intersection point of two sides of a plane figure
Vertex
a polygon having eight angles and eight sides
Octagon
an equilateral parallelogram having oblique angles
Rhombus
line segments that do not intersect
Parallel Line Segments
the line segment between two points on a given curve
Chord
the intersection point of two sides of a plane figure
Vertex
a triangle which has two sides equal
Isosceles Triangle
a quadrilateral plane figure having two parallel and two nonparallel sides
Trapezoid
two line segments which cross to form 90 degree angles
Perpendicular Line Segments
a curve that is continuous and has endpoints that meet at the same point
Closed Curve