Practicing Success
By using equations of the line $\frac{x+1}{2}=\frac{y}{3}=\frac{z-3}{6}$ and the plane $10 x+2 y-11 z-3=0$, answer the following questions. |
The acute angle between the line and the plane is |
$\cos ^{-1}\left(\frac{8}{21}\right)$ $\sin ^{-1}\left(\frac{8}{21}\right)$ $\sin ^{-1}\left(\frac{6}{7}\right)$ $\cos ^{-1}\left(\frac{6}{7}\right)$ |
$\sin ^{-1}\left(\frac{8}{21}\right)$ |
$\vec{n}$ of plane = $10\hat{i} + 2\hat{j} - 11\hat{k}$ $|\vec{n}| = n = \sqrt{10^2+2^2+11^2} = 15$ vector $\vec{v}$ || line = $2\hat{i} + 3\hat{j} + 6\hat{k}$ $|\vec{v}| = v = \sqrt{2^2+3^2+6^2} = 7$ θ → angle between line and place 90 - θ → angle between normal and line $\vec{n} . \vec{v} = nv \cos (90 - θ) ⇒ \frac{|20+6-6|}{15 \times 7}=\sin \theta$ so $\sin \theta=\frac{8}{21} \rightarrow \theta= \sin^{-1}(\frac{8}{21})$ Option: B |