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Math
Geometry
Unit 6 Geometry Vocabulary
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Terms in this set (40)
An angle whose measure is less than 90 degrees.
Acute Angle
An angle whose measure is exactly 90 degrees.
Right Angle
An angle whose measure is between 90 degrees and 180 degrees.
Obtuse Angle
An angle whose measure is exactly 180 degrees.
Straight Angle
Two angles whose measures have a sum of 90 degrees.
Complementary Angles
Two angles whose measures have a sum of 180 degrees.
Supplementary Angles
Two angles that share a common side and a vertex and do not overlap.
Adjacent Angles
A pair of opposite, congruent angles formed when two lines meet at a point.
Vertical Angles
The common endpoint of two rays/sides of an angle.
Vertex
Two geometric figures that are the same shape and size.
Congruent
Figures that have the same shape but not necessarily the same size.
Similar
A flat surface that extends without end.
Plane
Two lines in the same plane that do not intersect.
Parallel Lines
Two lines that meet at a point.
Intersecting Lines
Two lines that intersect to form 4 right angles.
Perpendicular Lines
A closed figure in a plane formed by 3 or more line segments.
Polygon
A polygon with three sides.
Triangle
The sum of the angle measures in any triangle.
180 degrees
A triangle with 3 acute angles.
Acute Triangle
A triangle with one right angle.
Right Triangle
A triangle with one obtuse angle.
Obtuse Triangle.
A triangle with 3 congruent sides.
Equilateral Triangle
A triangle with at least 2 congruent sides.
Isosceles Triangle
A triangle with no congruent sides.
Scalene Triangle
A polygon with 4 sides.
Quadrilateral
The sum of the angle measures in any quadrilateral.
360 degrees
A quadrilateral with exactly one pair of parallel sides.
Trapezoid
A quadrilateral with 2 pairs of parallel sides.
Parallelogram
A parallelogram with 4 right angles.
Rectangle
A parallelogram with 4 congruent sides.
Rhombus
A parallelogram with 4 right angles and 4 congruent sides.
Square
A polygon with 5 sides.
Pentagon
A polygon with 6 sides.
Hexagon
A polygon with 7 sides.
Heptagon/Septagon
A polygon with 8 sides.
Octagon
A polygon with 9 sides.
Nonagon
A polygon with 10 sides.
Decagon
A polygon that has all sides congruent and all angles congruent.
Regular Polygon
A two-dimensional shape like a stretched circle with slightly longer flatter sides.
Ellipse (Oval)
The two-dimensional figure that results from slicing a three-dimensional figure.
Cross Section
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