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Sixth grader geometry guide

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- 1. Lines Angles Triangles Quadrilaterals Circles My Guide to Geometry
- 2. Lines Points Line Segments Rays Lines Intersecting Lines Perpendicular Lines Parallel Lines Skew Lines
- 3. Points <ul><li>A point is a precise location in a space. It is labeled with a letter. </li></ul>Point s Point t Point m
- 4. Line Segments <ul><li>A line that starts at a point and ends at another. </li></ul>
- 5. Rays <ul><li>A line that starts at one point and keeps on going on the other. </li></ul>
- 6. Lines <ul><li>A line that keeps on going on both ends. </li></ul>
- 7. Intersecting lines <ul><li>Intersecting lines are lines that eventually cross at a point. </li></ul>
- 8. Perpendicular Lines <ul><li>Perpendicular lines are lines that intersect at right angles. </li></ul>
- 9. Parallel Lines <ul><li>Parallel lines are lines that never cross each other. </li></ul>
- 10. Skew Lines <ul><li>Skew lines are lines that are not in the same plane. </li></ul>
- 11. Angles Acute Obtuse Right Vertex/Vertices Complimentary Supplementary Vertical/Opposite Adjacent
- 12. Acute Angle <ul><li>An acute angle is an angle that is less than 90 degrees. </li></ul>
- 13. Obtuse Angle <ul><li>An obtuse angle is an angle that is more than 90 degrees. </li></ul>
- 14. Right Angle <ul><li>A right angle is an angle that is 90 degrees. </li></ul>
- 15. Vertex/Vertices <ul><li>A vertex is the middle point of an angle and vertices is the plural for vertex. </li></ul>
- 16. Complementary <ul><li>Complementary angles are two angles that make a 90 degree angle. </li></ul>60 30
- 17. Supplementary <ul><li>Supplementary angles are two angles that make a 180 degree angle. </li></ul>80 100
- 18. Vertical/Opposite <ul><li>Vertical and opposite are right across from each other. </li></ul>A B C D E BED and AEC Are vertical
- 19. Adjacent <ul><li>Adjacent angles are angles that are side by side and have a common vertex and ray. </li></ul>M P N Q R
- 20. Triangles Right Obtuse Acute Scalene Isosceles Equilateral Sum of Internal Angles Perimeter Angles
- 21. Right Triangles <ul><li>Right triangles are triangles that have a right angle. </li></ul>
- 22. Obtuse Triangles <ul><li>Obtuse triangles are triangles that have an obtuse angle. </li></ul>
- 23. Acute triangles <ul><li>Acute triangles are triangles that have an acute angle. </li></ul>
- 24. Scalene <ul><li>Scalene triangles are triangles that have no congruent sides. </li></ul>
- 25. Isosceles <ul><li>Isosceles triangles are triangles that have two congruent sides. </li></ul>
- 26. Equilateral <ul><li>Equilateral triangles are triangles that have all equal sides. </li></ul>
- 27. Sum of Internal Angles <ul><li>When you add up angles and they are 180 degrees. </li></ul>180 10
- 28. Perimeter <ul><li>To find the perimeter of a shape you have to add the up all the measurements. </li></ul>5cm 5cm 10cm 10cm
- 29. Angles <ul><li>Angles are the figures formed by two rays with a common endpoint. </li></ul>
- 30. Quadrilaterals Trapezoid Parallelogram Rectangle Rhombus Square Area of a rectangle Area of a square Area of a parallelogram Area of a trapezoid
- 31. Trapezoid <ul><li>A shape with one pair of parallel sides. </li></ul>
- 32. Parallelogram <ul><li>A shape that has two pairs of parallel sides. </li></ul>
- 33. Rectangle <ul><li>A quadrilateral that had four connected sides and all sides have 90 degree angles. </li></ul>
- 34. Rhombus <ul><li>A parallelogram that has no congruent sides. </li></ul>
- 35. Square <ul><li>A shape that has two pairs of parallel sides and congruent sides. </li></ul>
- 36. Area of a Rectangle <ul><li>To find the area of a rectangle, you have to multiply length times width. </li></ul>5cm 10cm
- 37. Area of a Square <ul><li>To find the area of a square, you have to multiply length times width. </li></ul>10cm 10cm
- 38. Area of a Parallelogram <ul><li>To find the area of a parallelogram you have to multiply the base times height. </li></ul>
- 39. Area of a Trapezoid <ul><li>To find the area of a trapezoid you have to multiply the two bases with the height. </li></ul>
- 40. Circles Chord Diameter Arc Radius Sector Circumference Area of a Circle
- 41. Chord <ul><li>A line segment with its endpoints on a circle. </li></ul>
- 42. Diameter <ul><li>A line segment that passes through the middle of a circle and has its endpoints on the edge of the circle. </li></ul>
- 43. Arc <ul><li>An arc is the distance on the outside edge of a circle. </li></ul>A B AB
- 44. Radius <ul><li>The distance from the center of a circle to the edge. </li></ul>
- 45. Sector <ul><li>A piece of the area of a circle. </li></ul>
- 46. Circumference <ul><li>The distance around a circle (perimeter.) To find the circumference you have to multiply pi (3.14) and the diameter. </li></ul>6cm
- 47. Area of a Circle <ul><li>The area of a circle is the space inside it. To find the area you have to multiply pi(3.14) and the radius of the circle squared. </li></ul>3cm
- 48. Other Polygons Hexagon Octagon Regular polygon
- 49. Hexagon <ul><li>A figure that has six equal sides. </li></ul>
- 50. Octagon <ul><li>A figure that has eight equal sides. </li></ul>
- 51. Regular polygon <ul><li>A polygon that has congruent sides and angles. </li></ul>

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