The brain needs exercise as well…

This evening’s exercise:

Surely, this approaches Parenting 301?

The tools: a nice cab from South America, a MacBook, Google, and of course the Khan academy.

Feel free to chime in.

JMM

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  3. A Celebration of Exercise

One reply on “The brain needs exercise as well…”

An answer:

I am not sure it was right, but here goes:

It centers on showing triangles DAB and CBA are congruent.

Proof:

AD=BC (given), angle DAB=CBA (given),
If segment AB=AB (reflexive property) (AB is a side of both triangles) then by
Side-angle-side the triangles DAB and CBA are congruent. If that is the case then angles,CAB=DBA which proves triangle ABE is isosceles.

I think you can also drop a bisector through E and prove it as well.

JMM

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