Quadrilaterals
A parallelogram with 4 sides of equal length and 4 right angles
Square
An angle that measures exactly 90 degrees.
Right Angle
An endless straight path with no end.
Line
An exact location in space.
Point
A triangle with all acute angles.
Acute Triangle
A parallelogram with 4 right angles
Rectangle
An angle that meansures less than 90 degrees.
Acute Angle
A part of a line with two endpoints.
Line Segment
A part of a line with one endpoint.
Ray
A triangle with one obtuse angle.
Obtuse Triangle
A quadrilateral with two sets of parallel lines.
Parallelogram
An angle that measures more that 90 degrees but less than 180 degrees.
Obtuse Angle
Lines that cross at one point.
Intersecting Lines
Polygon
A triangle with all equal sides.
Equilateral Triangle
A quadrilateral with one set of parallel lines.
Trapezoid
An angle that measures exactly 180 degrees.
Straight Angle
Lines that never intersect.
Parallel Lines
Congruent
Equal
A triangle with two sides that have the same measurement.
Isosceles Triangle
A parallelogram with 4 sides of equal length.
Rhombus
An angle that measures more than 180 degrees but less than 360 degrees.
Reflex Angle
Lines that intersect to form 4 right angles.
Perpendicular Lines
The angular point of a polygon or other figure.
Vertex
A triangle with all three sides that have different measurements.
Scalene Triangle