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dłuższa podstawa=a
6√3=a√3:2
a√3=12√3/:√3
a=12cm
z pitagorasa obliczam krótszą podstawę:
b=√12²-(6√3)²=√144-108=√36=6cm
pole=½(a+b)h=½(6+12)×6√3
=54√3cm²