Answer: sqrt(a 2 + b 2 + c 2 ).
- A a + b + c
- B sqrt(a + b + c)
- C a<sup>2</sup> + b<sup>2</sup> + c<sup>2</sup>
- D sqrt(a<sup>2</sup> + b<sup>2</sup> + c<sup>2</sup>)
Correct answer: D. sqrt(a<sup>2</sup> + b<sup>2</sup> + c<sup>2</sup>)
Explanation: Distance = sqrt(a<sup>2</sup> + b<sup>2</sup> + c<sup>2</sup>) 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