alleryThe distance between the points $(a,b)$ and $(-a,-b)$ is:
A$\sqrt{a^2+b^2}$
B$2\sqrt{a^2+b^2}$
C$2(a+b)$
D$0$
Answer & Solution
Correct answer: B. $2\sqrt{a^2+b^2}$
√[(2a)²+(2b)²] = 2√(a²+b²).
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