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Sunshine447 Group Title

Geometry... Please help!

  • one year ago
  • one year ago

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  1. Sunshine447 Group Title
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    • one year ago
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    @phi

    • one year ago
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    @jim_thompson5910

    • one year ago
  4. phi Group Title
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    these are a bit tricky. The first thing to do is read the theorem. What facts do they want to show?

    • one year ago
  5. Sunshine447 Group Title
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    I'm not sure what you mean...

    • one year ago
  6. phi Group Title
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    At the top of the page, it gives a theorem. What does the theorem say?

    • one year ago
  7. Sunshine447 Group Title
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    The segment joining the midpoints of two sides of a triangle is parallel to the third side and half its length.

    • one year ago
  8. Sunshine447 Group Title
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    But what does that mean? I don't understand the theorem itself...

    • one year ago
  9. phi Group Title
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    yes. there are two things the theorem says: 1) segment is parallel to the 3rd side 2) 1/2 its length those are the facts you have to prove. So those 2 facts should come at the end of the proof

    • one year ago
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    okay...?

    • one year ago
  11. phi Group Title
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    But what does that mean? |dw:1359066662711:dw|

    • one year ago
  12. phi Group Title
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    Do you understand ? the segment connects the middle of each leg now back to the problem. Can you figure out which statements are the 2 facts the theorem has to prove? which statements mean 1) segment is parallel to the 3rd side 2) 1/2 its length

    • one year ago
  13. phi Group Title
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    Lost ?

    • one year ago
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    4?

    • one year ago
  15. phi Group Title
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    Let's answer one at a time Of the statements I, II, III, IV, and V which one says segment is parallel to the 3rd side

    • one year ago
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    1

    • one year ago
  17. phi Group Title
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    yes. So statement I is one of the things that has to be proved. That means it can't be first. You don't start a proof by writing the conclusion first. Let's try to figure out what statement comes BEFORE statement I Statements IV and V talk about lengths, so I think those are for the other statement to prove. We will get to those later. Now of the statements that are left: II and III which one would you use to say you have parallel lines (proving statement I)

    • one year ago
  18. phi Group Title
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    In other words, look at the reason for statement I. which of the other statements support that reason ?

    • one year ago
  19. Sunshine447 Group Title
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    3 because it talks about having equal slopes?

    • one year ago
  20. phi Group Title
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    yes, so we have (so far) III, I if any of the answer choices have I before III we should cross it off the list

    • one year ago
  21. phi Group Title
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    now look a the reason for statement III: by the slope formula do you know what the formula is for finding the slope? what do you need to know to use the slope formula?

    • one year ago
  22. phi Group Title
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    remember slope is change in y divided by change in x

    • one year ago
  23. Sunshine447 Group Title
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    y=mx+b you have to know the y intercept and I forgot the other part

    • one year ago
  24. phi Group Title
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    that is the equation for a line in slope-intercept form. to find the slope m, you find the change in y divided by the change in x you need two points (x1,y1) and (x2,y2) so you can find (y2-y1)/(x2-x1) which of the statements gives you 2 points so you can find the slope?

    • one year ago
  25. Sunshine447 Group Title
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    2

    • one year ago
  26. phi Group Title
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    Yes, now we have II, III, I we have to do the statements in that order. II gives us points that we use in III to find the slopes that we use in I to say the slopes are = so if any of the answers has II after either III or I, you should cross it off. Have you done that yet?

    • one year ago
  27. Sunshine447 Group Title
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    So it's D? Thanks!

    • one year ago
  28. phi Group Title
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    double check. D has II at the end. But we know the order has to be II, III, I So I would cross off D

    • one year ago
  29. phi Group Title
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    look for a choice that II, III, I in that order (and ignore IV and V)

    • one year ago
  30. Sunshine447 Group Title
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    my bad, i meant to say B (typo)

    • one year ago
  31. phi Group Title
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    OK, I was wondering how you could pick D. notice we did not have to figure out the order of statements IV and V but you should know that V is the conclusion: it says the segment is 1/2 the length of side AC. A conclusion comes last. so the other statements have to be in the order IV, V

    • one year ago
  32. Sunshine447 Group Title
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    Okay, can you help me with another?

    • one year ago
  33. Sunshine447 Group Title
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    @phi can you help with another?

    • one year ago
  34. phi Group Title
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    ok post it

    • one year ago
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