three planes, E, F and G intersect so that each is perpendicular to the other two. A segment AB is positioned so that the length of its projection on the intersection of E and a F is 1, on the intersection of F and G is 2, and on the intersection of E and G is 3. What is the length f AB?
(a) radical 14
(b) 4
(c) 5
(d) 6
(e) radical 12

Question

mathmate · Answer

The segment AB is a vector of length sqrt(1^2+2^2+3^2)=sqrt(14)

anonymous · Answer

so the answer's A?