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icalibear

  • 3 years ago

Can somebody check my geometry homework and help with one question I can't get? PLEASE :(

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  1. icalibear
    • 3 years ago
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  2. aroub
    • 3 years ago
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    I disagree with you on 2 and 3

  3. icalibear
    • 3 years ago
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    I just guessed on 2 I don't know what they mean

  4. icalibear
    • 3 years ago
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    like what is that rule

  5. phi
    • 3 years ago
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    For Q2, do you know what SAS is short for?

  6. icalibear
    • 3 years ago
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    no what is it short fot? thats probably why i cant get it

  7. aroub
    • 3 years ago
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    In 2 they just want to you to choose which triangle can be proven by using "Side Angle Side" and that angle must be between those two sides.

  8. phi
    • 3 years ago
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    As aroub says, you want (in both triangles) Side Angle Side in that order

  9. icalibear
    • 3 years ago
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    oh so the answer would be G) because it's then angle

  10. icalibear
    • 3 years ago
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    side then*

  11. phi
    • 3 years ago
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    both triangles share the same side. so that is side. the next angle is 90 degrees, so you have the angle, then the 3rd side is marked congruent so G is SAS

  12. icalibear
    • 3 years ago
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    ok and for number 3 what did i do wrong there?

  13. phi
    • 3 years ago
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    for Q3, you could look for SSS or SAS. which one of the choices will give you one or the other?

  14. icalibear
    • 3 years ago
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    umm A), because it's SAS?

  15. phi
    • 3 years ago
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    Are you reading what I am ? A says PN=SQ those are sides. the picture gives you 2 sides. You need the 3rd (unmarked) sides to be =, or you need the angle between the marked sides to be equal (SAS means in that order)

  16. icalibear
    • 3 years ago
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    you would need <O and <S then because those are the unmarked angles that are equal?

  17. phi
    • 3 years ago
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    and angle O is between the 2 marked sides and S is between the 2 marked sides. It is not angle P= angle S because P is not between the marked sides

  18. icalibear
    • 3 years ago
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    oh got confused there ok so its D

  19. phi
    • 3 years ago
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    B says ON=QR but in the picture ON is marked with 2 dashes. ON matches the 2 dashes on OS. You would want the unmarked sides to be = (NP=QR) then you could use SSS. But the answer is D

  20. icalibear
    • 3 years ago
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    ok thanks i just got confused there and for the last one is the answer H)? since its the same thing as before?

  21. phi
    • 3 years ago
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    choice H would give you angle side angle in the first triangle what does angle F give you? (remember, you "read" the triangle side angle side angle and so on. If a side or angle is unmarked just say ? what does angle F give you?

  22. icalibear
    • 3 years ago
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    it looks like side-angle-angle-side

  23. icalibear
    • 3 years ago
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    oh i thought you said option F hold on

  24. icalibear
    • 3 years ago
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    f gives you angle-side-angle

  25. phi
    • 3 years ago
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    there are 3 sides and 3 angles. If we start with side DE, it is marked, so we can say side angle E is marked. so now we have side angle side EF is not marked so we have side-angle-? angle F is marked (per choosing option H) so side-angle-?-angle now side FD is unmarked: side-angle-?-angle-? finally, angle D is unmarked: side-angle-?-angle-?-? now we need in the exact order side-angle-side but we do not have that, because we have ? in between.

  26. icalibear
    • 3 years ago
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    so to prove it we have to find ? which has to be side

  27. icalibear
    • 3 years ago
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    the answer would be F) because thats side-angle-side-angle

  28. phi
    • 3 years ago
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    that would work. side-angle-?-angle-?-? ^ | if we can match this side (side EF) with the other triangle, we could use side-angle-side

  29. icalibear
    • 3 years ago
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    to match it with the other triangle you could flip EF and have it congruent then you would have s-a-s

  30. phi
    • 3 years ago
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    yes, side EF matched with HI gives SAS.

  31. icalibear
    • 3 years ago
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    ok got it. thanks so much>!

  32. phi
    • 3 years ago
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    OK. I hope it is not too confusing. A little practice helps.

  33. icalibear
    • 3 years ago
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    yeah definitely i just didn't know how i as suppose to read it or what sas stood for or anything so this definitely helped

  34. phi
    • 3 years ago
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    Here is a short video that is helpful http://www.khanacademy.org/math/geometry/triangles/v/finding-congruent-triangles

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