The length of the perpendicular drawn from the points (5,4,−1) to the line ¯¯¯r=ˆi+λ(2ˆi+9ˆi+5ˆk) is
The length of perpendicular drawn from the point (5,4, -1) to the line →r=^i+λ(2^i+9^j+5^k) is