ICTM 2021 Geometry Part 2: #15, #18, & #20
In the second part of the ICTM Geometry 2021, the difficulty of the questions increased a level. Questions 15 and 20 require specific knowledge on formulas to find the answers quickly and question 18 is especially worthwhile to solve, but time consuming.
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Question 15: 0:12
Question 18: 2:00
Question 20: 8:48