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Geometry Vocabulary Packet

Geometry Vocabulary Packet. Mrs. Jenkins 8 th Grade Mathematics. POINT: a mathematical figure pictured by a dot and named by a letter. CAPITAL LETTER. B. B D C. 2. LINE: a line segment extended without end in both directions. B D C. 3. LINE SEGMENT:

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Geometry Vocabulary Packet

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  1. Geometry Vocabulary Packet Mrs. Jenkins 8th Grade Mathematics

  2. POINT: a mathematical figure pictured by a dot and named by a letter. • CAPITAL LETTER B

  3. B D C 2. LINE: a line segment extended without end in both directions.

  4. B D C 3. LINE SEGMENT: a part of a line consisting of two endpoints and all the points between them.

  5. B D C 4. RAY: a line segment extended without end in one direction only. NOT

  6. B D C • COLLINEAR POINTS: points that lie on the same line. E B, D and C are collinear with each other E is not collinear with B, D and C

  7. B D C • ENDPOINT: a boundary point of a line segment or ray. The endpoint is B The endpoints are B and C

  8. 7. PLANE: a set of points on a flat surface that extends without end.

  9. COPLANAR: points or lines in the same plane.

  10. COMPASS: a drawing instrument used to draw arcs and circles.

  11. T • CIRCLE: a plane figure with all points the same distance from a given point called the center. Named for its center point: Circle T

  12. S R T V U Copy this diagram onto your packet. It will used as a reference for the next six terms.

  13. S R T V U • CHORD: a segment with both endpoints on the circle.

  14. S R T V U • DIAMETER: in a circle, a segment that passes through the center and that has both endpoints on the circle.

  15. Are the same arc? S R T V U • ARC: part of a circle.

  16. S R T V U • SEMI-CIRCLE: an arc that joins the endpoints of a diameter.

  17. S R T V U • RADIUS: in a circle, a segment that has one endpoint on the circle and the other endpoint on the center of the circle.

  18. S R T V U • TANGENT: a line that intersects a circle in exactly one point.

  19. CIRCUMFERENCE: the distance around a circle. T

  20. PI: the ratio of a circle’s circumference divided by its diameter.

  21. W X Y Review #1-18 Name the six rays.

  22. ANGLE: the figure formed by two rays sharing a common endpoint called a vertex.

  23. 20. SIDE: a. one of the rays of an angle b. a line segment whose endpoints are adjacent vertices of a polygon. side side

  24. vertex 21. VERTEX: (Vertices) a. the common endpoint of two rays that form an angle. b. the point of intersection of two sides of a polygon. c. the point of intersection of the edges of a polyhedron. vertex vertex

  25. 1 5 2 4 3 • ADJACENT ANGLES: angles that have a common vertex and share a common side between them.

  26. 1 5 2 4 3 • VERTICAL ANGLES: angles formed by intersecting lines and sharing only a vertex. Look for the Bow Tie!

  27. 24. PROTRACTOR: a device for measuring angles in units called degrees.

  28. 25. BISECT: to divide into two congruent parts.

  29. ACUTE ANGLES: an angle whose measure is between 0 and 90.

  30. 27. RIGHT ANGLES: an angle whose measure is 90

  31. 28. OBTUSE ANGLES: an angle whose measure is between 90 and 180.

  32. 29. STRAIGHT ANGLES: an angle whose measure is 180.

  33. 30. PERPENDICULAR LINES: lines that intersect to form right angles.

  34. 31. EQUAL ANGLES: angles with the same measure.

  35. 32. COMPLEMENTARY ANGLES: angles whose measures add up to 90.

  36. 33. SUPPLEMENTARY ANGLES: angles whose measures add up to 180.

  37. Keeping them Straight! Some ways to remember… Alphabetical and Numeric Order Complimentary 90 Supplementary 180 Supplementary Straight Line c S 180 90

  38. 34. CENTRAL ANGLE: an angle with its vertex at the center of the circle.

  39. POLYGON: a closed plane figure made by line segments. NOT Polygons… WHY?

  40. REGULAR POLYGON: a polygon with all sides congruent and all angles congruent.

  41. TRIANGLE: a polygon with 3 sides. The sum of the measure of the interior angles of a triangle must be 180

  42. Can these side lengths make a triangle? 5, 7, 3 9, 5, 2 How do you know? The sum of the 2 smaller side lengths must be greater than the length of the longest side.

  43. By Angle Measure 38.Acute Triangle 39.Obtuse Triangle 40.Right Triangle By Side Lengths 41.ScaleneTriangle 42.IsocelesTriangle 43.Equilateral Triangle Triangle Classification

  44. 38. ACUTE TRIANGLE: a triangle with three acute angles.

  45. 39. OBTUSE TRIANGLE a triangle with an obtuse angle.

  46. RIGHT TRIANGLE: a triangle with a right angle.

  47. SCALENE TRIANGLE: a triangle with no congruent sides.

  48. ISOSCELES TRIANGLE: a triangle with at least two congruent sides.

  49. EQUILATERAL TRIANGLE: a triangle with all three sides congruent.

  50. Adjacent Angles (9 pair) Vertical Angles (3 pair) 6 1 2 8 3 9 7 4 5 Supplementary Angles (10 pair) Complimentary Angles (1 pair)

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