9/1/2025 Student Reflection Note from H

2018 AMC 12A Notes 🎉

😊 Only 2 Wrong — Great Job!

Wrong

• 22: Not sure how to express √abi cleanly.
      Couldn’t manage complex numbers or split the area into 4 pieces.
• 25: Was able to get the powers of 10 and simplify, but not the final casework step.

Right

15, 16, 17, 18, 19, 20, 21, 23, 24

8/31/2015 Student reflection notes from H

2019 AMC 12B Notes

Problems 20–25 → Wrong

• 20: Tried coordinate bash but didn’t realize AOBX is cyclic.
• 21: Very close, but made a mistake in casework.
• 22: No idea how to estimate.
• 24: Confusing — unsure how to approach.
• 25: Imaginary numbers solution was smart.
      Also homothety solution was smart too.

Problems 15–19, 23 → Right