Answer: sqrt(a2 + b2 + c2).
- A a + b + c
- B sqrt(a + b + c)
- C a2 + b2 + c2
- D sqrt(a2 + b2 + c2)
Correct answer: D. sqrt(a2 + b2 + c2)
Explanation: Distance = sqrt(a2 + b2 + c2) using the 3D extension of the Pythagorean theorem.
Three mutually perpendicular axes x, y, z meeting at the origin O, with a point P located by its (x, y, z) coordinates.
Concept context
Lines and planes in 3D space, direction cosines, distances, and angles