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Pp = a²√3 / 4
Pp = (2√3)²√3 / 4
Pp = 12√3 / 4
Pp = 3√3
h² + (√3)² = (√19)²
h² = 19 - 3
h² = 16/ √
h = 4
Pb = 3a*h / 2
Pb = 3*2√3*4 / 2
Pb = 6√3*4 / 2
Pb = 24√3 / 2
Pb = 12√3
Pc = 3√3 + 12√3
Pc = 15√3
Mam nadzieję, że pomogłam. ;)