Geometryhard · Past Paper
What is the distance between the parallel lines y = 2x + 5 and y = 2x - 5?
A10
B2 * sqrt(5)
Csqrt(5)
D5
✓ Correct Answer: B — 2 * sqrt(5)
Distance d = |c1 - c2| / sqrt(1 + m^2) = |5 - (-5)| / sqrt(1 + 2^2) = 10 / sqrt(5) = 2 * sqrt(5).
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