CA Geometry: More on congruent and similar triangles

[shardakar]

Absolutely love all your videos. Qn19. though... "There is no ASS in Congruency."

BC~EF does not give us enough proof that the triangles are congruent.

[ilikesonyps2]

at 6:01 can't you make it non-congruent by extending <DE???

[konopong]

For problem 19, A is the only correct answer as C cannot be correct since SSA, in the general case, does not prove similarity or congruence. See my comment to the previous video for an explanation.

[paulceltics]

i totally agree about the education that you are talking about

[paulceltics]

thanks

[hannuka149]

Side CB and EF would not be sufficient enough to prove that the 2 triangles are equal because you were told that angle A and angle D was congruent as well as side AC and DF. So, if "side B is congruent to side FE" was the right answer, the reasoning behind the response would be AS?S (you're missing an angle, so the triangles can't be congruent and the rule is broken). Thus, AB = DE is the correct answer (A).

[lildude8210]

Thank you very much

[mossheadstone]

That problem that you suspected had 2 correct answers has only one.

If CB is congruent to FE then you could draw 2 triangles. If FE is slightly shorter than FD the circle with center F and radius FE would intersect the horizontal-looking ray from F in two places.

Of course, I am a geometry math teacher so I have "SSA is not a triangle congruence rule" rattling around offensively in my brain.

[tabmejojo]

you spelled congruent wrong had trouble finding it. But you are seriously good teacher.

[kiaracm]

lol I actually like the rants