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12=1/3* a²* 3
12=a²
a=2√3
Pb= 4*1/2 a * hb
hb²= (1/2a)²+3²
hb²=(√3)²+9
hb²=3+9
hb=2√3
Pb=4*1/2*2√3*2√3
Pb=2*(2√3)²
Pb=2*4*3
Pb=24