HMMT February 2020 #0kcz

HMMT February 2020Hard

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Understand the scale

Scale 0.5: Easiest math competition problems, often solvable even for early middle school students without experience. 1: Problems strictly for beginners, often at a moderate middle school level. 1.5: Problems for stronger beginner students, on the level of the middling problems in most middle school contests. 2: For motivated beginners, harder questions from the previous categories. 2.5: More advanced beginner problems, hardest questions from previous categories. 3: Early intermediate problems that require more creative thinking. 3.5: Tougher early intermediate problems that consistently stretch into higher-level creative thinking or conceptual knowledge. 4: Intermediate-level problems. 4.5: Upper intermediate problems approaching the upper bound for non-invitational sprint math competitions. 5: More difficult AIME problems or simple proof-based Olympiad-style problems. 6: High-level AIME-styled questions or introductory Olympiad-level questions. 7: Tougher Olympiad-level questions, may require more technical knowledge. 8: High-level Olympiad-level questions. 9: Expert Olympiad-level questions. 9.5: The hardest problems appearing on Olympiads which the strongest students could reasonably solve. 10: Historically notorious problems, generally unsuitable for even very hard competitions because they are exceedingly tedious, long, and difficult.

Cyclic quadrilateralsTrigonometryAngle chasingConstructions and loci

Problem

Problem: Let $ABCD$ be a cyclic quadrilateral, and let segments $AC$ and $BD$ intersect at $E$ . Let $W$ and $Y$ be the feet of the altitudes from $E$ to sides $DA$ and $BC$ , respectively, and let $X$ and $Z$ be the midpoints of sides $AB$ and $CD$ , respectively. Given that the area of $AED$ is $9$ , the area of $BEC$ is $25$ , and $\angle EBC - \angle ECB = 30^{\circ}$ , then compute the area of $WXYZ$ .

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