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Angles in a Triangle

Angles in a Triangle. By Shirley Sides 2006. Definition. Polygon – a closed many straight-sided figure. Definition. Angle – two rays that meet at a common end point. Definition. Degree – a unit of measurement of an angle or arc, represented by the symbol º. 30 º. Definition.

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Angles in a Triangle

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  1. Angles in a Triangle By Shirley Sides 2006

  2. Definition • Polygon – a closed many straight-sided figure.

  3. Definition • Angle – two rays that meet at a common end point.

  4. Definition • Degree – a unit of measurement of an angle or arc, represented by the symbol º. 30º

  5. Definition • Triangle – a polygon with 3 angles and 3 straight sides.

  6. Property of triangles • The sum of all the angles equals 180º degrees. 60º 90º 30º

  7. Property of triangles • The sum of all the angles equals 180º degrees. 60º 90º 30º + 60º 180º 90º 30º

  8. Property of triangles • The sum of all the angles equals 180º degrees. 40º 90º 40º 50º + 180º 90º 50º

  9. Property of triangles • The sum of all the angles equals 180º degrees. 60º 60º 60º 60º + 180º 60º 60º

  10. What is the missing angle? 70º 70º ? ? + 180º 70º 70º

  11. What is the missing angle? 90º 30º ? ? + 30º 90º 180º

  12. What is the missing angle? 60º 60º ? ? + 180º 60º 60º

  13. What is the missing angle? 30º ? 78º ? + 78º 30º 180º

  14. What is the missing angle? 40º ? 40º ? + 40º 40º 180º

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