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Mathematics 17 Online
OpenStudy (anonymous):

Proportionality Theorem I have the first column of the proof I just need help with the second.

OpenStudy (anonymous):

OpenStudy (anonymous):

OpenStudy (anonymous):

@jim_thompson5910

OpenStudy (anonymous):

the first two are most likely incorrect

OpenStudy (anonymous):

Any ideas? :/

jimthompson5910 (jim_thompson5910):

why do you think the first two are incorrect?

OpenStudy (anonymous):

I am over all unsure about proofs. I am horrible when it comes to them

jimthompson5910 (jim_thompson5910):

see attached

OpenStudy (anonymous):

oh wow.

OpenStudy (anonymous):

guess I was right :p

jimthompson5910 (jim_thompson5910):

right in that the first two lines of the 2 column proof are incorrect? Or that they are correct?

OpenStudy (anonymous):

They are correct. :p

OpenStudy (anonymous):

2 down 4 more lines to figure out .-.

jimthompson5910 (jim_thompson5910):

why is angle ABC congruent to angle ADE ?

OpenStudy (anonymous):

I dont know. because they're congruent angles?

jimthompson5910 (jim_thompson5910):

That's circular reasoning and flawed. You cannot make a statement and then back up that statement with the same statement.

jimthompson5910 (jim_thompson5910):

see this page https://www.mathsisfun.com/geometry/parallel-lines.html

OpenStudy (anonymous):

ugh. I hate proofs. Does it have to do with Bisectors?

jimthompson5910 (jim_thompson5910):

go ahead and look through the link I posted be sure to play with the interactive applet

OpenStudy (anonymous):

They're corresponding angles?

jimthompson5910 (jim_thompson5910):

very good

jimthompson5910 (jim_thompson5910):

|dw:1433203991985:dw|

jimthompson5910 (jim_thompson5910):

|dw:1433204002334:dw|

jimthompson5910 (jim_thompson5910):

what about the next line?

OpenStudy (anonymous):

one sec lemme fill in the third

OpenStudy (anonymous):

Alrighty. give me a second to look on that link

OpenStudy (anonymous):

this one confuses me.. possibly consecutive interior angles?

jimthompson5910 (jim_thompson5910):

why?

OpenStudy (anonymous):

theres angles in and outside.. kind of.

jimthompson5910 (jim_thompson5910):

|dw:1433204262730:dw|

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