Question

The angle at which the normal to the plane 4x - 8y + z = 7 is inclined to y-axis is :

• A. $\cos^{-1}(\frac{4}{9})$
• B. $\cos^{-1}(\frac{1}{9})$
• C. $\cos^{-1}(\frac{8}{9})$
• D. $\cos^{-1}(\frac{5}{9})$

Answer 1

Answer: (C)

$\cos^{-1}(\frac{8}{9})$

Answer 2

The correct option is (C) :$\cos^{-1}(\frac{8}{9})$.