Quantcast

A community for students. Sign up today!

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

Sunshine447

  • one year ago

Geometry... Please help!

  • This Question is Closed
  1. Sunshine447
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    1 Attachment
  2. Sunshine447
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    @phi

  3. Sunshine447
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    @jim_thompson5910

  4. phi
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    these are a bit tricky. The first thing to do is read the theorem. What facts do they want to show?

  5. Sunshine447
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    I'm not sure what you mean...

  6. phi
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    At the top of the page, it gives a theorem. What does the theorem say?

  7. Sunshine447
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    The segment joining the midpoints of two sides of a triangle is parallel to the third side and half its length.

  8. Sunshine447
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    But what does that mean? I don't understand the theorem itself...

  9. phi
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    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

  10. Sunshine447
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    okay...?

  11. phi
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    But what does that mean? |dw:1359066662711:dw|

  12. phi
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    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

  13. phi
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Lost ?

  14. Sunshine447
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    4?

  15. phi
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    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

  16. Sunshine447
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    1

  17. phi
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    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)

  18. phi
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    In other words, look at the reason for statement I. which of the other statements support that reason ?

  19. Sunshine447
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    3 because it talks about having equal slopes?

  20. phi
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    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

  21. phi
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    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?

  22. phi
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    remember slope is change in y divided by change in x

  23. Sunshine447
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    y=mx+b you have to know the y intercept and I forgot the other part

  24. phi
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    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?

  25. Sunshine447
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    2

  26. phi
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    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?

  27. Sunshine447
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    So it's D? Thanks!

  28. phi
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    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

  29. phi
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    look for a choice that II, III, I in that order (and ignore IV and V)

  30. Sunshine447
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    my bad, i meant to say B (typo)

  31. phi
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    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

  32. Sunshine447
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Okay, can you help me with another?

  33. Sunshine447
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    @phi can you help with another?

  34. phi
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    ok post it

  35. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Ask a Question
Find more explanations on OpenStudy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.