The angle between the lines, whose direction cosines l, m, n sati… - Vidyadip

MCQ

The angle between the lines, whose direction cosines $l, m, n$ satisfy the equations $l+m+n=0$ and $2 l^2+2 m^2-n^2=0$, as

A
$60^{\circ}$
✓
$180^{\circ}$
C
$90^{\circ}$
D
$30^{\circ}$

✓

Answer

Correct option: B.

(b) $180^{\circ}$

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