This document provides definitions and explanations of basic geometry terms related to lines, angles, triangles, quadrilaterals, and circles. It defines key concepts like points, lines, planes, perpendicular and parallel lines, acute, obtuse and right angles. It also defines types of triangles based on side lengths and angles. Common quadrilaterals like rectangles, squares, parallelograms and trapezoids are defined. Finally, it covers circle elements such as chords, diameters, arcs, radii, sectors, circumference and area.

1. Geometry guide for dummies Line Quadrilaterals Triangles Circles Angles

2. Lines Points Skew Line segments Rays Lines Intersecting lines Perpendicular lines

3. Points A point is a precise location in space. It is labeled with a letter.

4. Lines Two points connected going two different ways

5. Planes A flat surface

6. Skew Line not in the same plane

7. Line segment A line pointing both direction

8. Ray A line pointing one way

9. Intersecting Lines Line that intersects

10. Perpendicular Two Lines lines the same plane but will never touch

11. Parallel Two line that will never intersect

12. ANGLES Acute Obtuse Right Straight Vertex / vertices's Complementary Supplementary Vertical / opposite Adjacent

13. Acute An angle less than 90 degrees

14. Obtuse An angle over 90 degrees

15. Right An angle that is 90 degrees

16. Straight A 180 degree angle

17. Vertex/ verticies A point where two lines meet

18. Complementary Two angles adding to 90 degrees

19. Supplementary Two angles adding to 180 degrees 120 60

20. Vertical/ opposite Two angles on opposite sides that equal the same amount of degrees

21. Adjacent Angles that are side by side

22. Triangles Right Obtuse Acute Scalene Isosceles Equilateral Sum of internal angles Perimeter Area

23. Right A triangle with all equal sides

24. obtuse A triangle over 90 degrees

25. Scalene A triangle with no equal sides

26. Isosceles A triangle with 2 equal sides

27. Equilateral A triangle with all equal sides

28. Sum of internal angles All the angles inside

29. Perimeter The product of the width and height 2 19 12 1 17

30. Quadrilaterals Quadrilateral Trapezoid Parallelogram rectangle Rhombus Square Area of a rectangle Area of a square Area of a Parallelogram Area of a Trapezoid

31. Quadrilateral A shape with 4 parallel sides

32. Trapezoid A shape with two parallel sides

33. Parallelogram A shape with two equal sides

34. Rectangle A shape with 4 congruent sides

35. Rhombus A rectangle but also a diamond

36. Square A rectangle but with 2 sets of parallel sides

37. Area of a rectangle The base of the rectangle and the height of the rectangle.

38. Area of a parallelogram Outside of a parallelogram

39. Area of a trapezoid What is in the trapezoid 10 16 12 20

40. Circles Chord Diameter Arc Radius Sector Circumference Area of a circle Other polygons

41. Chord Segment connecting two points A C

42. Diameter 2x the radius

43. Arc The distance around the edge 3.14

44. Radius Half the diameter

45. Sector A piece of the area

46. Circumference The perimeter around the circle R 2

47. Area of a circle The area around a circle

48. Other Polygons Trapezoids, etc.

49. Bye!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Made by Emiliano