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# Unit 2 - Mr. Hunt

### 2D Geometry

TermDefinition
side line segment that make up a polygon
angle two rays or lines that share a common point or vertex
congruent equal in size or length
parallel lines two lines that would never intersect when headed in both directions forever
perpendicular two lines that intersect at a 90 degree angle
straight angle a 180 degree angle
right angle a 90 degree angle
obtuse angle an angle greater than 90 degrees
acute angle an angle less than 90 degrees
vertical angles the congruent opposite angles that are formed when two lines intersect
adjacent angles two angles that share a common side, line, or ray
complimentary angles two angles that sum to 90 degrees
supplementary angles two angles that sum to 180 degrees
concave polygon a shape or polygon that is curved inwards
convex polygon a shape or polygon that is curved outwards
degree a measure for angles
exterior angles the angle made outside of a shape
interior angles the angle made from the inside of a shape
irregular polygon a polygon where are all side and angles are not equal
polygon a many sided, closed figure
protractor a tool used for measuring and drawing angles
regular polygon a polygon with all sides equal in length and all angles equal in size
rectangle a quadrilateral where all angles are 90° and opposite sides are congruent
reflectional symmetry A type of symmetry where a line could be drawn and one half is a reflection of the other half
rotation a circular movement of a shape around a fixed point
rotational symmetry A type of symmetry where a shape can be rotated (less than a full turn) around a fixed point and remain the same
tesselation a pattern made of identical shapes
transversal a line that crosses at least two other lines
triangle a 3 sided polygon
pentagon a 5 sided polygon
hexagon a 6 sided polygon
heptagon a 7 sided polygon
octagon a 8 sided polygon
nonagon a 9 sided polygon
decagon a 10 sided polygon
dodecagon a 12 sided polygon
rhombus a 4 sided polygon where all sides are equal
square a 4 sided polygon where all sides are equal and all angles are 90°
parallelogram a 4 sided polygon with 2 pairs of parallel sides
trapezoid quadrilateral where only one pair of opposite sides are parallel.