JAMB 2010 · UTME · Q35

Coordinate geometry

Find the distance between the points $\left(\frac12, \frac12\right)$ and $\left(-\frac12, -\frac12\right)$ .

Worked solution (try it first)

The changes are $\frac12 - \left(-\frac12\right) = 1$ in $x$ and 1 in $y$ .
By Pythagoras the distance is $\sqrt{1^2 + 1^2} = \sqrt2$ , option A.

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