The angle between the planes and is

MATHEMATICS · Subjective · CBSE · Mathematics · Three-Dimensional Geometry · Three-Dimensional Geometry

Problem

The angle between the planes r⃗⋅(3i^−4j^+5k^)=0\vec{r} \cdot (3\hat{i} - 4\hat{j} + 5\hat{k}) = 0 and r⃗⋅(2i^−j^−2k^)=0\vec{r} \cdot (2\hat{i} - \hat{j} - 2\hat{k}) = 0 is (A) π3\frac{\pi}{3} (B) π2\frac{\pi}{2} (C) π6\frac{\pi}{6} (D) π4\frac{\pi}{4}

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