Answers

2015-07-15T19:11:04+08:00
Because he thinks that perseus will get killed by the gorgons :D
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2015-07-15T19:11:10+08:00
Polydectes true motive in sending Perseus to kill Medusa it is because he believes that Perseus will turn to  a stone and he will be able to marry Persues mother.

Polydectes true motive is to sent away Persues because he's jealous of Danae's (Perseus mother) attention to Perseus.
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