Mathematics for IGCSE & O level - Coordinate Geometry (Section 4 - No. 8)
The line segment AB has endpoints A(1, 5) and B(3, 9). What is the length of AB?
2
sqrt(8)
sqrt(20)
2 * sqrt(5)
Explanation
Using the distance formula: sqrt((3-1)^2 + (9-5)^2) = sqrt(2^2 + 4^2) = sqrt(4 + 16) = sqrt(20) = 2 * sqrt(5)
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