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2h=a√3
a=2h/√3
a=2×12/√3
a=24/√3
a=8√3
Obw=3a
Obw=3×8√3=24√3
12=a√3/2 ×2
24=a√3 ÷√3
24/√3=a
a=8√3
Ob=8√3 ×3=24√3