Midterm Exam Review
Jan 10th, 2012 by corricelli
Hello,
Use this spot to collaborate to review for your upcoming midterm exam!
Here is a link to the midterm review packet handed out in class on Tuesday, 1/17: Midterm Exam Rev
Happy studying,
Mrs. Corricelli
I was wondering what days you will be staying after this week 1/15.
Libby,
Tues and Thurs! See you on Thursday!
Keep up the hard work,
Mrs. Corricelli
I was doing the review proofs on the first packet you gave us and on number 32, which is the last proof on the back of the packet, I was confused on what BATC stood for? It was the justifications for the segment AC is congruent to the segment BC
Cierra,
Sorry for the delay. BATC stands for Base Angles Theorem Converse.
If you want to abbreviate in this way, that is fine. I would just assume Conv to Base <s Thm or Base <s Thm Conv. However, I would accept the abbreviation too.
Hope this helps,
Mrs. Corricelli
Hi, remember the question 3 on the last page of the Review packet #1 that you helped out Kayla with in class today? I need help on it, I split the shape apart so that it’d be easier, but since it takes form of 2 trapezoids, I’m confused on showing how those are congruent to show that segment EA is congruent to DC. Can you explain to me?
An,
I am assuming you mean 3 on the Proofs Review. The last page of review 1 is number 32 and that proof does not have to do with trapezoids.
I am a little confused by your saying that the shape “takes the form of 2 trapezoids”. For most triangle congruence proofs, you want two triangles. Revisit how you are taking the shape apart? Look at the two triangles: EAB and DCB.
Then continue on… Post here – I’ll wait for your post after you take out the two triangles. If someone else can help, please do!!!
Thank you,
Mrs. Corricelli
Hi Mrs.Corricelli, I apologize for replying late, but I did see your reply on Saturday and I just wanted you to know, I found my mistake, cause I thought that with angle ABD congruent to angle EBC would make it a trapezoid, at least the way I drew it, but now I know You have to use the angle addiction postulate to conclude that angle ABE is congruent to angle CBD.
An,
Thanks for letting me know! So glad!
Mrs. Corricelli
hi i have a few questions on the ch. 3 test the ones marked midterm 1st on # 10 are all three proofs included in the midterm? Then on #9 i cant find where i wrote down how to solve it do we just treat it like a normal prior proof in the 4 intersecting lines? finally on number 11 im a bit lost after saying m<3 + m<4 = 180 with definition of supp. <'s
Luke,
First question: Yes. Similar proofs are on the midterm.
Second question: Yes. But 9 is not a proof. You needed to show work. m<A + m<D = 180 degrees. So 7x+20 + x = 180. Then solve. Then, since the expressions 6y + 10 and 7y – 5 are in corresponding parts on two parallel lines they are congruent. Set them equal and solve.
Third question: The "after m<3 + m<4 = 180" is most of the proof. I do not understand your question completely.
Hope this helps,
Mrs. Corricelli
hi yes i probably should have reworded my question but what i ment to say was how do we justify for the last step which is r ll s?
never mind i solved it myself
Will we have to know the area or perimeter of a trapezoid for the midterm?
Libby,
Nope, but area of a circle, circumference of a circle, and area and perimeter of triangles, rectangles, or squares is fair game!
Thank you,
Mrs. Corricelli
PS: Go to bed early.
Its crucial that you can think clearly.
Hi Mrs. Corricelli(:
I’ve been going through the review packets and I was having trouble with number 41 on Review number 4…I’m not sure how I am supposed to solve for x…I know that they are on the same line, but this doesn’t make them equal to 180degrees because normally that’s if they’re alternating, which they’re not…I also had a question on number 26 on review packet 3, I don’t really understand what the question is asking. Thanks so much(:
-aMy
Aargh – Amy – I left my review packets at school! Ok – how does the diagram look? You said that they are on the same line – are they between two parallel lines? Please describe the diagram and I will do my best to help. I’ll be up for another hour waiting to hear from you (hopefully)!!!
Sorry that I left them at school,
Mrs. Corricelli
that’s ok..the diagram is two parallel lines (l and m) with one transversal going through the middle…line l and m are going from the bottom left to top right and the transversal and going through from the top left to the bottom right…ok so in the top left hand outer angle it is x+4 and the bottom left hand outer angle is 2x-1…and i have to solve for x and im not sure exactly how to do it. hope this explains it somewhat
Ok – so (hopefully) I have this… To confirm – if you look at the diagram, does 2x-1 correspond with the angle that would be a linear pair with x+4? I think this is what you are describing. If so, then, this means that these two angles are supplementary. Corresponding angles are congruent. Since x + 4 and 2x – 1 are not corresponding, but one of these would correspond with an angle that would be a linear pair, these two angles are supplementary. Try to put it in the diagram and see… So… x + 4 + 2x – 1 =180? I do hope this is correct. If you want to come a bit early, I can confirm this.
Go to sleep. Get a good night’s sleep. Thinking clearly tomorrow is most important now.
Happy dreaming,
Mrs. Corricelli
What is the difference between segment add post and angle add post? Im cofused in those. And also, for one of the definitions, we need to know the def of between…. What is that?
Also, how do u find BC. On problem # 10, packet 1
you can find BC by the converse to base angles theorem so you take 2x-5=x+3, do the algebra and then x should equal 8…hope this helps(:
Laura,
segment add postulate is when you have segments, like parts of a line and add them together. for example, if you have a line,
A_____________B_______________C and it tells you that B is the midpoint of AC then you could say that AB is congruent to BC right? so you could say AB + BC = AC…that would be segment addition postulate.
For angle addition postulate, it is the same thing but you use it when you have parts of an angle.
sorry Laura i meant to relpy here but it made my answer a new post. i answered your question about segment add post. and angle add. post below.
Loving the teamwork Libby, Laura, and Amy!!!
Thanks ladies – keep it up!
Mrs. Corricelli