Distance between two points $P(x_1, y_1, z_1)$ and $Q(x_2, y_2, z_2)$ in 3D is:
A$\sqrt{(x_2-x_1)^2 + (y_2-y_1)^2 + (z_2-z_1)^2}$
B$\sqrt{(x_2-x_1)^2 + (y_2-y_1)^2}$
C$|x_2-x_1| + |y_2-y_1| + |z_2-z_1|$
D$(x_2-x_1)(y_2-y_1)(z_2-z_1)$
Answer & Solution
Correct answer: A. $\sqrt{(x_2-x_1)^2 + (y_2-y_1)^2 + (z_2-z_1)^2}$
3D distance formula: $\sqrt{\Delta x^2 + \Delta y^2 + \Delta z^2}$.
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