alleryStart learning →If l, m, n are the direction cosines of the normal, the normal form of the plane is
Al/x + m/y + n/z = p
Blx + my + nz = p
Cx/l + y/m + z/n = p
Dl(x + y) + nz = p
Answer & Solution
Correct answer: B. lx + my + nz = p
Taking the unit normal n = li + mj + nk in r · n = p gives lx + my + nz = p.
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