First slide

Direction ratios and direction cosines

Question

If the angles made by a line with the positive directions of X and Y-axes are complementary angles then the angle made by the line with Z- axis is

Moderate

A

0
B

$\frac{π}{3}$
C

$\frac{π}{4}$
D

$\frac{π}{2}$

Solution

$α = θ \Rightarrow β = 90^{0} - θ$
$\cos^{2} α + \cos^{2} β + \cos^{2} γ = 1 \Rightarrow γ = 90^{0}$

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App