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HKIMO 2026 THPT (Grades 10–12 shared) National Preliminary Set 02 Question 18

HKIMO · HKIMO 2026 THPT (Grades 10–12 shared) National Preliminary Set 02

Question 18

Find the minimum distance from $A(0,1)$ to the line $y=-x$.
  1. $\frac{\sqrt2}{4}$
  2. $2\sqrt2$
  3. $\sqrt2$
  4. $\frac{\sqrt2}{2}$