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Geometry Unit Five Word Bank 1. Diagonal A segment from one vertex to another vertex in a polygon. 2. Isosceles Trapezoid A trapezoid with congruent legs. 3. 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. 4. Midsegment Another name for the median of a trapezoid. Geometry Unit Five Word Bank 5. Parallelogram A quadrilateral with two pairs of parallel sides 6. Rectangle A parallelogram with four right angles 7. Rhombus A parallelogram with four congruent sides 8. Square A parallelogram with four right angles and four congruent sides Geometry Unit Five Word Bank 9. Trapezoid A quadrilateral with exactly one pair of parallel sides 10. Quadrilateral A four-sided polygon 11. Polygon A closed shape made up of line segments 12. Regular Polygon A polygon that has all congruent sides and all congruent angles. Geometry Unit Five Word Bank 13. Convex Polygon A polygon where the extension of no sides enters the polygon 14. Concave Polygon A polygon where the extension of one or more sides enters the polygon 15. Pentagon A five-sided polygon 16. Hexagon A six-sided polygon Geometry Unit Five Word Bank 17. Heptagon (Septagon) A seven-sided polygon 18. Octagon An eight-sided polygon 19. Nonagon A nine-sided polygon 20. Decagon A ten-sided polygon Geometry Unit Five Word Bank 21. Dodecagon A twelve-sided polygon 22. N-gon An N-sided polygon