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Mathematics 9 Online
OpenStudy (anonymous):

Use the image shown below to answer the question that follows. The two-column proof below proves the following theorem: The three medians of a triangle all intersect in one point. Statements Reasons Point F is a midpoint of Point E is a midpoint of Draw Draw By Construction Point G is the point of intersection between and Intersecting Lines Postulate Draw By Construction Point D is the point of intersection between and Point H lies on such that By Construction and Midsegment Theorem and Substitution BCGH is a para

OpenStudy (anonymous):

OpenStudy (anonymous):

ignore the weird part im gonna retype it

OpenStudy (anonymous):

OpenStudy (anonymous):

@jim_thompson5910

OpenStudy (anonymous):

@Hero

OpenStudy (anonymous):

@UnkleRhaukus

OpenStudy (anonymous):

@jim_thompson5910

OpenStudy (anonymous):

ayudame

jimthompson5910 (jim_thompson5910):

so you just want to fill in that empty reason?

OpenStudy (anonymous):

yeah heres the options By Construction Properties of a Parallelogram Midsegment Theorem Intersecting Lines Postulate

jimthompson5910 (jim_thompson5910):

which one do you think it is

OpenStudy (anonymous):

i know it isnt by construction

OpenStudy (anonymous):

wait

OpenStudy (anonymous):

hold on

jimthompson5910 (jim_thompson5910):

ok

OpenStudy (anonymous):

how is point D an intersection for segment AG when it doesnt extend to d

jimthompson5910 (jim_thompson5910):

good thinking, but AG is NOT a segment when they write |dw:1359168842839:dw| it's actually a line

OpenStudy (anonymous):

so they are saying it does expand past the d?

jimthompson5910 (jim_thompson5910):

yes it extends infinitely in both directions

OpenStudy (anonymous):

well in a sense that was constructed

jimthompson5910 (jim_thompson5910):

what you construct is what you draw with a pencil, straightedge and compass

jimthompson5910 (jim_thompson5910):

can you just plot D anywhere you like?

jimthompson5910 (jim_thompson5910):

if you could, then you'd be creating the point D by construction

OpenStudy (anonymous):

ok so i guess that isnt what they are looking for...i guess the intersecting lines postulate would make sense..it's simple but it works

jimthompson5910 (jim_thompson5910):

and that's the correct answer, to make sure that point D is on both lines, you would just intersect them

jimthompson5910 (jim_thompson5910):

that locks D in so to speak to that one spot only

OpenStudy (anonymous):

ok thanks

OpenStudy (anonymous):

The answer is (Intersecting Lines Postulate)

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