Thursday, January 8, 2026

2020 AIME I reflection notes from H

2020 AIME I - Reflection Notes from H

Did: #8–15

Had trouble / wrong: #12, #15

Need Review / Unclear:

#12 – Don’t know LTE, but I was very close to solving this using the binomial theorem.
#15 – Wasn’t able to see the symmetry: the circumcircle of IBC (with the orthocenters) is a reflection of the circumcircle of ABC.

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