Geometry Unit 6 Test Review
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21 Terms
Polygon
A closed plane figure with at least 3 sides that are segments, where each segment intersects exactly two other segments at their endpoints.
Regular Polygon
A polygon with all sides and angles equal.
Irregular Polygon
A polygon with sides and angles that are not all the same.
Convex Polygon
A polygon with all the vertices pointing out.
Concave Polygon
A polygon with one or more vertices caving in.
Isosceles Triangle
A triangle with at least two sides of equal length.
Parallelogram
A quadrilateral where both pairs of opposite sides are parallel.
Triangle
A polygon with 3 sides.
Quadrilateral
A polygon with 4 sides.
Pentagon
A polygon with 5 sides.
Hexagon
A polygon with 6 sides.
Heptagon
A polygon with 7 sides.
Octagon
A polygon with 8 sides.
Nonagon
A polygon with 9 sides.
Decagon
A polygon with 10 sides.
Undecagon
A polygon with 11 sides.
Dodecagon
A polygon with 12 sides.
Sum of Interior Angles of a Polygon
(n - 2) * 180 degrees.
Each Interior Angle of a Regular Polygon
(n - 2) * 180 / n degrees.
Each Exterior Angle of a Regular Polygon
360 / n degrees.
Theorems of a Parallelogram
Opposite sides are congruent, opposite angles are congruent, consecutive angles are supplementary, diagonals bisect each other, one angle is supplementary to both consecutive angles, both pairs of opposite sides are parallel, and one pair of opposite sides is both parallel and congruent.