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Ppc=24
Ppc=2* a²√3/4 +3aH
24=2* 2²√3/4 +3*2*H
24=8√3/4+6H
24=2√3+6H
6H=24-2√3 //: 6
H=(4-√3/3)cm
c)
Ppc=3√3a²+6aH
Ppc=24
24=3√3*2²+6*2*H
24=3√3*4+12H //: 3
8=4√3+4H
4H=8-4√3 //: 4
H=(2-√3)cm