Geometryeasy · Past Paper
Find the distance between P(a, b) and Q(-a, -b).
Asqrt(a^2 + b^2)
B2 * sqrt(a^2 + b^2)
C0
Da + b
✓ Correct Answer: B — 2 * sqrt(a^2 + b^2)
Distance = sqrt((-a-a)^2 + (-b-b)^2) = sqrt((-2a)^2 + (-2b)^2) = sqrt(4a^2 + 4b^2) = 2*sqrt(a^2+b^2).
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