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Dec 18, 2022 at 12:58 comment added quantinho You mentioned you worked on EB=EC, I thought you got that part. The first part is also straightforward as mentioned in above comment. Once you see E in on AD, EM becomes perpendicular to BC.
Dec 18, 2022 at 11:36 comment added Cookie Thanks for your answer! The second part of the question seems pretty easy, it looks like the really hard part is proving $EB=EC$
S Dec 18, 2022 at 10:50 review First answers
Dec 18, 2022 at 10:52
S Dec 18, 2022 at 10:50 history answered quantinho CC BY-SA 4.0