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MathNet 2021 — Part 03 Question 41

Math Olympiad Vault · MathNet 2021 — Part 03

Question 41

In triangle $ABC$ we have $\angle ACB = 90^\circ$. The point $M$ is the midpoint of $AB$. The line through $M$ parallel to $BC$ intersects $AC$ in $D$. The midpoint of line segment $CD$ is $E$. The lines $BD$ and $CM$ are perpendicular.
Question illustration
Be aware: the figure is not drawn to scale.

a. Prove that triangles $CME$ and $ABD$ are similar.

b. Prove that $EM$ and $AB$ are perpendicular.