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More HELP! needed – MUS geometry lesson 27
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Okay, I am having major trouble checking DD’s work for these lessons (25-27) because I don’t understand how these charts of proofs really work. They have the student fill in a chart of statements and reasons to find the correct postulate for the proof at the end. In lesson 27, she has gotten the first statement & reason correct and the last statement & reason correct. It’s the part in between where you have to choose particular angles or triangles and give the reason as alternate interior angles, reflexive property, etc. That’s the part she gets wrong.
If any of your students have recently completed lesson 27 (proving triangles similar with AA….), could you tell me if there is more than one choice for that middle part? I would think the answer key would say if there was more than one answer possible, so I’m guessing the answer to my question is no. I don’t know how to explain to her which to choose and which reason would correspond. I’m not even sure if she is close on this.
I looked at a couple of videos on proving triangle similar on Khan Academy, but they don’t have you fill in charts like this for practice, so I don’t know how to proceed with the MUS worksheets and test. DD was carrying a B+ average on her tests so far, but since lesson 25, she’s tanked. So it seems like this part is not getting through. She keeps telling me she understands which triangles are similar but she doesn’t know “what they want” her to put in the middle part of the chart.
A couple things: One tip I learned recently is that you should have your daughter write out the list of possible theorems so that she has a list of them to refer to when she’s trying to figure out what to put in there. I wish I had done this with my son (he just went through these lessons at the beginning of this year). I think there is a list of them in one of the lessons, around Lesson 24 or 25.
Second: I do think there is more than one possible answer for some of the proofs. When my son’s answers didn’t match the answer key, but they were still true and reasonable, then I didn’t mark them wrong. I could be wrong about that and if I am, I hope someone with more experience in MUS geometry will chime in, but it did seem to me that some of them weren’t totally cut and dry.
Hope that helps a little.
That is helpful. I looked at the corrections page on the MUS website and didn’t find any corrections to the answer key for those worksheets or tests. There was one day when I asked her to sit and explain to me why she gave the answers she did, and her explanations seemed plausible. She also said that she could see why the answers in the key would be suitable, so I am wondering if there could be more than one answer to some parts of these proofs.
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