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Mathematics 9 Online
OpenStudy (anonymous):

Given the above, which method would you use to prove AEC ≅ BED?

OpenStudy (anonymous):

OpenStudy (anonymous):

A. AAS B. SSS C. SAS D. ASA

OpenStudy (mathmate):

You need more information than just the diagram. Please check the question

OpenStudy (anonymous):

nope thats it all the information

OpenStudy (anonymous):

ce=de

OpenStudy (mathmate):

Then it could be any of the four choices, since insufficient information is given.

OpenStudy (anonymous):

K -_-

OpenStudy (anonymous):

@magbak

OpenStudy (mathmate):

@yahya90 how did you get the information?

OpenStudy (mathmate):

@Jameela_leonard what does "given the above" refer to?

OpenStudy (anonymous):

the diagram obviously

OpenStudy (mathmate):

It does not even say what is required. Are the two congruence of the two triangles given, or are we to prove congruence?

OpenStudy (anonymous):

Yes theyre congruent

OpenStudy (mathmate):

In that case what can you say about angles BCD and ACD?

OpenStudy (anonymous):

idk

OpenStudy (mathmate):

...given that triangles ACD and BCD are congruent?

OpenStudy (anonymous):

that theyre congruent

OpenStudy (mathmate):

Remember that to prove two triangles congruent, we need at least three congruent items, be they angles or sides. How many congruent items have your found so far between triangles AEC and BED?

OpenStudy (anonymous):

so its d

OpenStudy (anonymous):

??????????????

OpenStudy (mathmate):

d could be correct if you can justify it. Which are the angles and the sides that are congruent?

OpenStudy (mathmate):

Here's the deal: Since angles BCD and ADC are equal (congruence of triangles) then EC=ED ... 1st congruence item. Since AD=BC (congruence of triangles) we subtract congruence segments ED and EC to get AE = BE (second congruence item) Also, angles AEC and BED are congruent (vertically opposite angles), that supplies the third congruent item, which completes the proof of congruence of triangles ACE and BDE. Now it's up to you to choose the choices.

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