a=2\/3 H=4/3cos30° = 2/3 2 v3 Росн=а- Sбок=3a H=3-2 /3 2 /3 /3=36 Sполн=Sбок+2Soch=36+6=42
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a=2\/3 H=4/3cos30° = 2/3 2 v3 Росн=а- Sбок=3a H=3-2 /3 2 /3 /3=36 Sполн=Sбок+2Soch=36+6=42