1. Geometry Unit Five Word Bank
Diagonal
A segment from one vertex to another vertex in a polygon.
Isosceles Trapezoid
A trapezoid with congruent legs.
Median (of a trapezoid)
A segment from the midpoint of one leg to the midpoint of the other leg in a trapezoid. Its length is the average of the lengths of the two bases of the trapezoid.
Midsegment
Another name for the median of a trapezoid.

2. Geometry Unit Five Word Bank
Parallelogram
A quadrilateral with two pairs of parallel sides
Rectangle
A parallelogram with four right angles
Rhombus
A parallelogram with four congruent sides
Square
A parallelogram with four right angles and four congruent sides

3. Geometry Unit Five Word Bank
Trapezoid
A quadrilateral with exactly one pair of parallel sides
Quadrilateral
A four-sided polygon
Polygon
A closed shape made up of line segments
Regular Polygon
A polygon that has all congruent sides and all congruent angles.

4. Geometry Unit Five Word Bank
Convex Polygon
A polygon where the extension of no sides enters the polygon
Concave Polygon
A polygon where the extension of one or more sides enters the polygon
Pentagon
A five-sided polygon
Hexagon
A six-sided polygon

5. Geometry Unit Five Word Bank
Heptagon (Septagon)
A seven-sided polygon
Octagon
An eight-sided polygon
Nonagon
A nine-sided polygon
Decagon
A ten-sided polygon

6. Geometry Unit Five Word Bank
Dodecagon
A twelve-sided polygon
N-gon
An N-sided polygon