1. Plane figure with segments for sides
polygon

2. Angles with a common vertex, common side and no interior points in common
Adjacent angles

3. A position in space with no size
point

4. Two non-adjacent angles formed when two lines intersect
Vertical angles

5. Lines in the same plane that don’t intersect
Parallel lines

6. An angle with measure of less than 90 degrees
Acute

7. An Angle with measure equal to 90 degrees
Right angle

8. An Angle with measure greater than 90 degrees
Obtuse Angle

9. Point that divides a segment into two equal parts
midpoint

10. A flat surface with no thickness that extends indefinitely in all directions
Plane

11. Union of two rays with common endpoint that are non-collinear
Angle

12. Two lines that intersect to form right angles
Perpendicular lines

13. The common endpoint of two rays or segments
Vertex

14. Part of a line that is bounded by one endpoint
Ray

15. Two angles with a sum of 180 degrees
Supplementary Angles

16. Non-coplanar lines that do not intersect
Skew lines

17. A part of a line that is bounded by two endpoints
Segment

18. To cut in two equal parts
bisect

19. Two angles with the sum of 90 degrees
Complementary angles

20. Two figures with equal measure
Congruent

21. A series of points that extend in opposite directions without end
line

22. Point that divides a segment into two equal parts
midpoint

23. Polygon with opposite sides that are parallel
parallelogram

24. Polygon with 5 sides
pentagon

25. Six sided polygon
Hexagon

26. Quadrilateral with one pair of parallel sides
trapezoid

27. Four sided polygon
Quadrilateral

28. A segment that connects nonconsecutive vertices of a polygon
Diagonal

29. A convex polygon with all sides and angles congruent
Regular Polygon

30. A quadrilateral with four equal sides
Rhombus

31. A parallelogram with 4 congruent angles.
Rectangle

32. The _________ of a trapezoid is parallel to the bases and its measure is half the sum of the bases.
Median

33. The non-parallel sides of a trapezoid.
legs

34. A triangle with at least two equal sides
Isosceles triangle

35. Triangle with all acute angles
Acute triangle

36. Triangle with one obtuse angle
Obtuse triangle

37. Triangle with one right angle
Right triangle

38. A segment that connects a vertex to the midpoint of the opposite side of a triangle
median

39. Any line segment from a vertex perpendicular to the base, also the height of a figure
altitude

40. A triangle with all sides equal
Equilateral triangle

41. Figures with corresponding angles congruent and corresponding sides in equal ratios
Similar

42. A triangle with no equal sides
Scalene triangle

43. A ________ polygon has an exterior angle sum of 360 degrees.
Convex

44. The _________ angle sum of a convex polygon with “n” sides is given by the formula:
Interior