Angle Measurements
- 1. Angles and their Measurements Delaine Sanders www.flicr.com/photos/34669486/N00/40234362
- 3. Angle Parts http://www.flickr.com/photos/dcab2/3514913853/ 2 Rays and a Vertex
- 4. Angle Parts . B B A B C RAY BC -> RAY BA -> POINT B BC BA
- 5. Angle Parts C A B 2
- 6. Angle Naming B A B C C B A 2 A B C 2
- 7. Angle Naming A B C D 1 2
- 8. Angle Naming A D B or B D A B D C or C D B A D C or C D A 1 2 A B C D 1 2
- 9. Angle Naming Practice (STOP) A B C D E F G
- 10. Measuring Angles Degrees The angle is the amount of rotation from one ray to the other ray.
- 11. Measuring Angles
- 13. protractor Measuring Angles 50 50 – 0 = 50 m = 50
- 14. protractor Measuring Angles 130 130 – 0 = 130 m = 130
- 15. Measuring Angles 50 50 – 0 = 50 180 – 130 = 50
- 16. Measuring Angles (STOP) Measuring Angles Practice – image on note sheet Note sheet, clear protractors and 6 inch rulers Paper Practice Measure side angle Measure corner angle Fold in half, measure corner angle
- 17. 0 ° - 90 ° Acute Angles
- 19. Acute Angles
- 20. 90 ° - 180 ° Obtuse Angles
- 22. Obtuse Angles
- 23. = 90 ° Right Angles
- 26. Straight Angle = 180 ° .
- 27. Straight Angle http://www.flickr.com/photos/forevermoosed/469130102/ http://www.flickr.com/photos/bolivar-trindade/3203862834/
- 28. Straight Angle
- 29. Interior / Exterior Point . A E C D F .
- 30. Interior / Exterior Point . A E C D Point A is interior to D E C Point F is exterior to D E C Ray EA is interior to D E C F .
- 31. Angle Addition Postulate The sum of the two smaller angles will always equal the measure of the larger angle .
- 32. Angle Addition Postulate The sum of the two smaller angles will always equal the measure of the larger angle . m MRK + m KRW = m MRW
- 33. Angle Addition Postulate 2 1 1 + 2 = A B C A B C
- 34. Angle Addition Postulate 2 1 1 = 30 – 0 = 30 2 = 70 – 30 = 40 ABC = 30 + 40 = 70 A B C
- 35. Angle Addition Postulate http://www.flickr.com/photos/svyates/2415340942/ 1 2 Angle 1 = 2x Angle 2 = x Solve for angle 1
- 36. Angle Bisector An angle bisector is a ray that divides an angle into two equal angles. A B C E ABC CBE m ABC = m CBE
- 39. Bisected Angle Ray UK bisects angle U. What is the measure of angle U?