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Mathematics 11 Online
OpenStudy (anonymous):

Prove the diagonals of a parallelogram bisect one another. Be sure to create and name the appropriate geometric figures.

jimthompson5910 (jim_thompson5910):

|dw:1399682531073:dw|

jimthompson5910 (jim_thompson5910):

|dw:1399682553823:dw|

jimthompson5910 (jim_thompson5910):

hint: try to prove that triangle AEB = triangle CED

OpenStudy (anonymous):

Ok, can you go through it with me please?

OpenStudy (anonymous):

DE=BE And DC=AB?

jimthompson5910 (jim_thompson5910):

DE=BE is something we arrive at and we aren't given it DE=BE is something we want to prove

OpenStudy (anonymous):

Ok

OpenStudy (anonymous):

But I'm not sure how to prove it..

jimthompson5910 (jim_thompson5910):

what kind of angles are these two angles |dw:1399682971763:dw|

OpenStudy (anonymous):

Parallel?

jimthompson5910 (jim_thompson5910):

AB and CD are parallel

jimthompson5910 (jim_thompson5910):

parallel angles makes no sense though

OpenStudy (anonymous):

So then interior angles

jimthompson5910 (jim_thompson5910):

alternate interior angles

jimthompson5910 (jim_thompson5910):

because AB and CD are parallel, what can we say about the alternate interior angles ?

OpenStudy (anonymous):

We can say that they are congruent

jimthompson5910 (jim_thompson5910):

correct

jimthompson5910 (jim_thompson5910):

the same can be said for these two angles here |dw:1399683130606:dw|

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