In the right 3-corner pir de 2-sided angle at base=30 degrees and the side of the base. 4dm. find the S-side of the pyramid?

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In the right 3-corner pir de 2-sided angle at base=30 degrees and the side of the base. 4dm. find the S-side of the pyramid? and got a better answer

Response from CrazyCOOLer[+]

Response from 0[+++++]
I haven't tried it myself.

 

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