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H=2a
4√3=¼a₂√3×H
4√3=¼a₂√3×2a
4√3=½a₂√3×a /×2
8√3=a³√3 /÷√3
8=a³ /∛
a=2
H=4
Pc=2×¼a²√3+3aH
Pc=½a²√3+3aH
Pc=½×2²√3+3×2×4
Pc=½×4√3+24
Pc=2√3+24= 2(√3+12)