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# Geometry Guide

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### Geometry Guide

1. 1. Lines Angles Triangles Quadrilaterals Circles Geometry Guide
2. 2. lines Points Line Segments Ray Lines Intersecting Perpendicular Parallel Skew Lines
3. 3. Points A point is a precise location in space. It is labled with a letter. Point M Point L Points
4. 4. ' A line that starts one place and ends at another. Point A Point M Line Segments
5. 5. ' Starts one place and goes on for who knows. Ray
6. 6. ' A line is something that goes on forever. Lines
7. 7. Intersecting Two lines that meet in the middle. Intersecting
8. 8. ' Lines that meet in the middle and make right angles. Perpendicular
9. 9. ' Two lines next to each other but never intersect Parallel
10. 10. ' Lines that are in the same plane but never meet. Skew
11. 11. . Acute Obtuse Right Vertex/Vertices Complementary Supplementary Vertical/Opposite Adjacent Angles
12. 12. . An acute is an angle that is less then 90 degrees Acute Angle
13. 13. . An obtuse is an angle that is more then 90 degrees Obtuse Angle
14. 14. . An angle at exactly 90 degrees. Right Angle
15. 15. . A straight angle is two 90 degrees it is 180 degrees Straight Angle
16. 16. . The dot where two lines in an angle meet Vertex/ Vertices
17. 17. . Two angles are complementary if the sum measures to 90 degrees. 50 deg 40 deg Complementary
18. 18. . When you add the angles to 180 degrees. 180 degrees Supplementary
19. 19. . Angles that are vertical to each other Vertical / Opposite
20. 20. . Angles that are right next to each other Adjacent
21. 21. . Right Obtuse Acute Scalene Isosceles Equilateral Sum of internal angles Perimeter Area Triangles
22. 22. A triangle with the bigger angle a right angle Right
23. 23. A triangle with the bigger angle being obtuse Obtuse
24. 24. Acute A triangle with the greater angle an acute Acute
25. 25. A triangle with no congruent sides Scalene
26. 26. A triangle with two congruent sides Isosceles
27. 27. All sides are congruent Equilateral
28. 28. Sum of Internal Angles
29. 29. The outside of a shape added together 90 90 50 50 50 +50 +90 +90= 280 Perimeter
30. 30. The inside amount of a shape. 20 30 Area
31. 31. Quadrilaterals Quadrilateral Trapezoid Parallelogram Rectangle Rhombus Square Area of Rectangle Area of square Area of Parallelogram Area of trapezoid
32. 32. Quadrilateral A four sided figure.
33. 33. Trapezoid A quadrilateral with two parallel lines
34. 34. Parallelogram Opposite sides are parallel and congruent
35. 35. Rectangle Parallelogram with four right angles
36. 36. Rhombus A parallelogram with two congruent sides.
37. 37. Square Rectangle with four congruent sides
38. 38. Area of a rectangle Length times height
39. 39. Area of a Square Length times height
40. 40. Area of a Parallelogram Length times height divided by half
41. 41. Area of a Trapezoid Height times length divided by half
42. 42. Circles Chord Diameter arc Radius Sector Circumfrence Area of a Circle Other Polygons
43. 43. Chord A line segment with two points on the circle
44. 44. Diameter A line segment that passes through the center of the circle
45. 45. Arc A part of a circle
46. 46. Radius With one end point in the middle and the other on th edge
47. 47. Sector A region enclosed by two radii and the arc
48. 48. Circumference Area of the circle
49. 49. Area of a circle The circumference is the area
50. 50. Polygons are shapes Other Polygons