Show that the shortest distance from the origin to l can be written | a × u |
――――
| u |
(2) Two planes having equations r . n1 = λ1 and r . n2 = λ2 intersect in the line l.
Show that a = (n1 × n2) × (λ2 n1 - λ1 n2 )
――――――――――― is a point on l.
| n1 × n2 |²
Hence find the point where the three planes
r . n1 = λ1 , r . n2 = λ2 , r . n3 = λ3 .
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