Question

If the projections of a line on the co-ordinate axes be 2, –1, 2, then the length of the lines is

• A. 3
• B. 4
• C. 2
• D. $\frac { 1 } { 2 }$

Answer 1

Answer: (A)

3

Answer 2

$r = \sqrt { 4 + 1 + 4 } = 3$.