1. Geometry Vocab Stephanie Jimenez

2. Angle The union of two rays having a common endpoint, the rays are the sides of the angle and the common endpoint is the vertex

3. Dodecagon 24.08.2009 A polygon having twelve sides A dodecagon has twelve sides.

4. Scalene Triangle 25.08.2009 Triangle having no sides of the same length They are three kinds of triangles: isosceles, scalene and…….. equal triangle.

5. Concentric Circles 26.08.2009 Circles having the same center but with different radii Many concentric circles have a different radii.

6. Postulate 27.08.2009 A statement accepted as true without having to be proven to be true He postulated that the circle was round.

7. Hypotenuse 31.08.09 The side opposite the right angle in a right triangle: the longest side of a right triangle

8. Compass 1.09.09 A construction tool used to draw arcs and circles

9. Circle 3.09.09 The set of all points in a plane that are equidistant from a given point known as the center of the circle (x-h) 2 + (y-k) 2 =r 2

10. Acute Angle An angle having a measure greater that 0 degrees but less then 90 degrees

11. Complementary Angles 9.9.09 Two angles whose sum equals 90 degrees

12. Diameter 9.10.09 A chord that passes through the center of a circle

13. Parallel Lines 11.09.09 Coplanar lines that do not intersect

14. Polygon 14.09.09 A plane figure bounded by a number of line segments; the minimum number of sides is 3

15. Theorem 15.09.09 A statement in math which must be proven to true

16. Adjacent Angles 17.09.09 Two angles having a common side and vertex but do not overlap; no common interior points

17. Orthogonal 18.09.09 Intersecting of right angles

18. Hemisphere 21.09.09 the surface bounded by half of a sphere and a plane through the center of the sphere

19. Incenter 23.09.09 the point of concurrency of the triangle’s angle bisectors

20. KITE 24.09.09 a quadrilateral in which two disjoint pairs of consecutive sides are congruent

21. Collinear 25.09.09 points that lie on the same line A collinear line has points in it.

22. Skew Lines 29.09.09 lines that do nor intersect and are not coplanar

23. Perpendicular Lines 30.09.09 lines that intersect at right angles

24. Transversal 01.10.09 a line which intersects two or more coplanar lines in distinct points

25. Obtuse Angle 02.10.09 an angle having a measure greater than 90 degrees but les than 180 degrees

26. Prism 05.10.09 a polyhedron with two congruent faces, called bases, that lie in parallel planes; the other faces are called lateral faces

27. Proof 06.10.09 a convincing argument that shows why a statement is true

28. Slant Height 08.10.09 the height of a lateral face of a pyramid the mouse ran up the slant height of the grain pile

29. Circumference 09.10.09 the distance around a circle

30. Straightedge 12.10.09 a construction tool used to draw segments: a ruler without marks

31. Inscribed Angle 13.10.09 an angle of a circle having its vertex on the circle and the sides of the angle are chords of the circle

32. Isosceles Triangle 14.10.09 a triangle with at least two congruent sides; equilateral triangles are isosceles

33. Hypothesis 15.10.09 the phrase following the word “if” in a conditional statement

34. Octagon 16.10.09 a polygon having eight sides A stop sign is an octagon.

35. Logic 19.10.09 the analysis of the patterns of reasoning by which conclusions are validly derived from sets of premises

36. Similar Figures 20.10.09 figures that have the same shape Similar figures have the same shape.

37. Angle of depression 21.10.09 an angle formed by a horizontal line and the line of sight to an object below the level of the horizontal

38. Rhombus 10.22.09 a quadrilateral with four equal sides A kite is a rhombus.

39. Rectangle 10.23.09 parallelogram with 4 right angles We found the area of the rectangle in class.

40. Deductive Reasoning 26.10.09 a process of reasoning logically from given facts to a conclusion

41. Sector 27.10.09 a region of a circle determined by two radii and a part of the circle

42. Translation 28.10.09 a transformation that moves points the same distance and in the same direction; a slide

43. Heptagon 2.11.09 a polygon having seven sides

44. Interior Angle 3.11.09 An angle whose sides are determined by two consecutive sides of a polygon

45. Midpoint 4.11.09 A point that divides a segment or an arc into two congruent parts

46. Arc 5.11.09 A figure consisting of two points on a circle and all points on the circle needed to connect them to a single part A part of a circle

47. Apothem 6.11.09 A segment joining the center of a regular polygon to the midpoint of one of the polygon’s sides

48. Tangent 9.11.09 A line that intersects a circle at exactly one point

49. Frustum 10.11.09 The part of a solid cone or pyramid formed by cutting off the top by a plane parallel to the base

50. Acute Triangle 11.11.09 A triangle having three acute angles

51. Corollary 13.11.09 A statement that follows directly from another theorem and that can easily be proved from that theorem to be true