what is the formula of plane angle
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In the Cartesian form, the equation of two planes may be written as a1x + b1y + c1z + d1 = 0 and a2x + b2y + c2z + d2 = 0. Let us consider as the angle between the normal to the two planes and (a1, b1, c1) & (a2, b2, c2) are the direction ratios of the normal to both the planes in consideration.
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