The angle between two planes is defined as:

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(B) The angle between two planes is defined as the angle between their normal vectors. If the equations of the two planes are $a_1x + b_1y + c_1z + d_

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The angle between the normals to them from any point

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(B) The angle between two planes is defined as the angle between their normal vectors. If the equations of the two planes are $a_1x + b_1y + c_1z + d_1 = 0$ and $a_2x + b_2y + c_2z + d_2 = 0$,their normals are $\vec{n_1} = a_1\hat{i} + b_1\hat{j} + c_1\hat{k}$ and $\vec{n_2} = a_2\hat{i} + b_2\hat{j} + c_2\hat{k}$. The angle $	heta$ between the planes is given by $\cos 	heta = \frac{|\vec{n_1} \cdot \vec{n_2}|}{|\vec{n_1}| |\vec{n_2}|}$.

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