Let $\alpha, \beta $ two planes s.t. $\alpha || \beta$ and $A, B, C, D\in \alpha $ four distinct points.
Find $P\in \beta $ s.t. $PA+PB+PC+PD $ is minim.
Let $\alpha, \beta $ two planes s.t. $\alpha || \beta$ and $A, B, C, D\in \alpha $ four distinct points.
Find $P\in \beta $ s.t. $PA+PB+PC+PD $ is minim.
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