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# Planar Geometry Terms

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A list of geometry terms, illustrations, and definitions by a sixth grader.

A list of geometry terms, illustrations, and definitions by a sixth grader.

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### Transcript

• 1. Geometry Guide Lines planes points angles
• 2. Point A dot with a letter
• 3. Lines A line that goes on for ever f s
• 4. Line Segment A straight line s m
• 5. Ray One line that goes on for ever f d
• 6. Plane A flat end that extends s d a
• 7. Intersecting Two lines that cross
• 8. Perpendicular A right angle 90 degrees
• 9. Parallel Two lines that don't cross
• 10. Skew Lanes that are not in the same plane
• 11. Acute A 50 degree angle
• 12. Obtuse A 180 degree angle
• 13. Vertex/ Vertice The middle point
• 14. Right A 90 degree angle
• 15. Straight A straight angle that equals thats 180 degrees
• 16. Complementary If the measure is 90 degree 15 75
• 17. Supplementary If the measure is 180 degrees 100 80
• 18. Vertical/ Opposite Are opposite two lines interesect r m n p q
• 19. adjacent Side by side common vertex and ray s t w d f
• 20. Triangles Obtuse Acute Right Equilateral Isosceles Scalene
• 21. Obtuse Triangle The greatest angle is the obtuse that equals 180
• 22. Acute Triangle The greatest angle is an acute angle that equals 180
• 23. Right Triangle The greatest angle is a right angle that equals 180
• 24. Equilateral triangle 3 congruent sides
• 25. Isosceles Triangle At least 2 congruent sides
• 26. Scalene Triangle No congruent sides
• 27. Perimeter Add all the sides up 5 5 15 5+5+15=25
• 28. Sum of Internal Angles The sides and the triangles 4 sides and 2 triangles 2 x 180 = 360
• 29. Area Time the base and height 10 20 15
• 30. Quadrilaterals Trapezoid Parallelogram Rectangle Rhombus Square
• 31. Quadrilateral A box that makes 4 right angles
• 32. Trapezoid 2 set of parallel line
• 33. Parallelogram 4 connected sides
• 34. Rectangle Four right angles
• 35. Rhombus Four congruent sides
• 36. Square Congruent sides
• 37. Area of a Rectangle Times the outside then divided by two 25 10
• 38. Area of a Square The outside is times then divided 6 8
• 39. Area of a Parallelogram Times and then divided
• 40. Area of a Trapezoid The outsides are times then divided 9
• 41. Circles Chord diameter sector radius
• 42. Chord Where you draw a line at the top
• 43. Diameter The middle part of a circle
• 44. Arc A part of a circle named by two rays with common endpoints. a b