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Tutors Answer Your Questions about Geometry proofs (FREE)
Question 221424: I am having a really hard time with proofs in geometry. This problem comes from the Essentials of Geometry for College Students; Chapter 2.5, exercise 19:
Given: Line Segment (LS) AB is congruent to LS DE; LS AB is perpendicular to LS BD; and, LS DE is perpendicular to LS BD.
Prove: LS AC is congruent to LS EC
I can see that the figure is clearly 2 right angles adjacent to one another making them equal in measure; that point C is the midpoint of LS AE and LS DE as well as the vertex of both Triangles ABC and EDC. But, the trouble I'm having is putting them into a logical sequence. I know I have to prove one thing to move onto the next but putting them in the right order is difficult because there are so many ways to get the same answer. Can you help me with any tips that will make this process easier for me?
The answer to this specific question is given in the back of the book but I'm more interested in the process than the answer. I need to train my brain to think linearly which is what these types of exercises will do. The teacher I have isn't really helping much or should I say, isn't speaking in terms that are clicking with me.
I look forward to your response.
Thank you,
Cheri
Click here to see answer by jim_thompson5910(13787)   |
Question 223861: I really dont get how to do proofs and such. We just started on them in Geometry but our teacher completely lost me. The homework seems like it is written in a foreign language to me.
The problem is:
Suppose point T is the midpoint of RS and point W is the midpoint of RT. If XY = (supposed to be about equal to) RT and TS has a length of z, write the length of the segment in terms of z for RT.
Click here to see answer by MLipsky(9) |
Question 232517: I'm trying to do the proofs myself because I know they are important, but I'm just having trouble moving from one step to another. It's hard for me to figure out what comes next after each statement. Do you have any tips for me?
Click here to see answer by ly12603(33)  |
Question 234187: Hi I'm currently doing home school and I have geometry. My question is how do you know if it's SSS, ASA or SAS in a proof? I've been doing good answering the problems, but I've only been guessing. I want to understand it better, I'm going to do state testing next couple of months.
Thanks.
Click here to see answer by solver91311(5072)  |
Question 160235: ._____._________._____.
A B C D
Statements Reasons
AC=BD GIVEN
AC=AB+BC Def. of Betweenness
BD= BC+CD Def. of Betweenness
AB+BC=BC+CD SUBSTITUTION PROPERTY
BC=BC REFLEXIVE PROPERTY
AB=CD TRANSITIVE PROPERTY
Click here to see answer by smartguy101(5) |
Question 236672: Proof Assignment:
I Made the picture in Ms Paint, and posted it on photo bucket, this is my first time doing this, i hope one of my picture links works. Thanks again!
[URL=http://s971.photobucket.com/albums/ae197/marksc92/?action=view¤t=Proof1.jpg][IMG]http://i971.photobucket.com/albums/ae197/marksc92/th_Proof1.jpg[/IMG][/URL]
Click here to see answer by jim_thompson5910(13787) |
Question 237001: How many answers can there be for a proof? Say you put "definition of congruent angles" but the real answer is "vertical angle theorem", aren't they the same thing basically? yes, vertical angle theorem says that they share a vertex, but they are also congruent so shouldn't they both be accepted?
Click here to see answer by solver91311(5072) |
Question 237402: Okay, so im doing Properties, Definitions, Theorems & Proofs in class and i need a bit of help.
How do you write a proof for this given:
∠FOG ≅ ∠IOH
(if the symbols dont show up, the first one is an angle sign, the second is a congruent sign, & the third is another angle sign).
Click here to see answer by solver91311(5072) |
Question 237403: Prove triangle ABC is isoceles
Given: angle BAD is congruent to angle CAD
line segment AD is perpendicular to line segment BC
The answers that I originally gave were:
statement: BD is congruent to CD
reason: definition of a bisector
statement: angle BAD is congruent angle CAD
reason: ray AD is the bisector of angle BAC (given)
statement: AD is equal to AD
reason: reflexive property of equality
statement: triangle ABD is congruent to triangle ACD
reason: SAS of congruency of triangles
statement: angle ABD is congruent to angle ACD
reason: CACT
grading comments: While the effort is appreciated, the proof contains several errors. revise.
Click here to see answer by Edwin McCravy(2920) |
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Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630
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