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kylea

geometry question?

  • one year ago
  • one year ago

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  1. kylea
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    • one year ago
  2. Grazes
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    Both?

    • one year ago
  3. kylea
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    yes please!

    • one year ago
  4. Grazes
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    The first one is not similar because the sides are not in proportion. 3 can correspond to the 6 (x2) but if you apply the same thing to the 2 (2x2=4), you don't get 5. So they're not similar

    • one year ago
  5. kylea
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    alright that makes sense

    • one year ago
  6. Grazes
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    For the 2nd one, 10+5=15 and 14+7=21. 10 and 14 (sides of the other triangle) relate to 15 and 21 because 10/14=15/21. You know this cuz you can simplify them both to 5/7

    • one year ago
  7. kylea
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    okay i get that but how do you know what they are similar by? is it sss?

    • one year ago
  8. Grazes
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    Oh. The similarity theorem is always by AA. SSS is if the numbers for the triangles are the same because it proves that the triangles are congruent.

    • one year ago
  9. kylea
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    always? let me show you this other problem... would it be AA for it to?

    • one year ago
  10. kylea
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    • one year ago
  11. Grazes
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    |dw:1341959357505:dw| That would be by SAS

    • one year ago
  12. Grazes
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    As for your problem, it would be AA because you see that 2 angles are already congruent and you know that there's another set of congruent angles by (Vertical angles are congruent)

    • one year ago
  13. Grazes
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    GIH and JIK are the vertical angles, btw

    • one year ago
  14. kylea
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    okay thank you!

    • one year ago
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