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# Geometry: Angles and Polygons

AB
acute angleAn angle with a measure greater than zero degrees but less than 90 degrees.
anglewo rays with a common endpoint.
bisectTo separate something into two congruent parts.
complementaryTwo angles whose measures have a sum of 90 degrees.
congruentHaving the same measure.
congruent figuresFigures that are the same shape and size.
corresponding partsThe parts of congruent figures that match.
degreeThe most common unit of measure for angles.
equilateral triangleA triangle having all three sides congruent and all three angles congruent (all angles equal 60 degrees).
heptagonA polygon having seven sides.
hexagonA polygon having six sides.
isosceles triangleA triangle in which at least two sides are congruent.
line of symmetryA line that divides a figure into halves that are reflections of each other.
line symmetryFigures have this when two halves of the figure match.
obtuse angleAn angle that measures greater than 90 degrees but less than 180 degrees.
octagonA polygon having eight sides.
parallelogramA quadrilateral that has both pairs of opposite sides congruent and parallel.
pentagonA polygon having five sides.
perpendicularTwo line segments that intersect to form right angles.
polygonA simple closed figure in a plane formed by three or more line segments.
rectangleA quadrilateral with opposite sides congruent and parallel and all angles are right angles.
regular polygonA polygon having all sides congruent and all angles congruent.
rhombusA parallelogram with all sides congruent.
right angleAn angle that measures exactly 90 degrees.
rotational symmetryA figure has this if it can be turned or rotated less than 360 degrees about a fixed point so that the figure looks exactly as it did before being turned.
scalene triangleA triangle in which no sides are congruent.
sideA ray that is part of an angle.
similar figuresFigures that have the same shape but different sizes.
squareA parallelogram with all sides congruent, all angles are right angles,, and opposite sides are parallel.
straight angleAn angle that measures exdactly 180 degrees.
supplementaryTwo angles whose measures have a sum of 180 degrees.
triangleA polygon having three sides.
vertexThe common endpoint of the two rays that form an angle.