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anonymous

  • one year ago

Prove that the sum of the measures of the interior angles of a triangle is 180°. Be sure to create and name the appropriate geometric figures.

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  1. DanJS
    • one year ago
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    You can use parallel lines and a transversal if that works for you

  2. DanJS
    • one year ago
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    |dw:1438046185578:dw|

  3. DanJS
    • one year ago
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    |dw:1438046248433:dw|

  4. DanJS
    • one year ago
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    did you learn about those things?

  5. anonymous
    • one year ago
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    of coarse

  6. DanJS
    • one year ago
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    ok fill out equivalent angles somewhere so that a b and c form a line

  7. DanJS
    • one year ago
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    move a to its corresponding angle, and move c to the alternate interior

  8. DanJS
    • one year ago
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    |dw:1438046415721:dw|

  9. anonymous
    • one year ago
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    so c is the intersecting point now?

  10. DanJS
    • one year ago
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    they want you to show that the angles (a + b + c) = 180

  11. DanJS
    • one year ago
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    using the parallel line and transversal line, you can arrange angles a b and c to make a line, which is 180 degrees

  12. anonymous
    • one year ago
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    okay so this now would be a straight proving they equal 180

  13. DanJS
    • one year ago
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    yes

  14. anonymous
    • one year ago
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    okay thank you

  15. DanJS
    • one year ago
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    you can say...

  16. DanJS
    • one year ago
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    |dw:1438046829479:dw|

  17. DanJS
    • one year ago
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    A + C is supplmntary to B , so A + B + C must be 180

  18. anonymous
    • one year ago
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    yes that makes sense

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