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α=30 stopni
Pc=2Pp+Pb
1m=100cm
1²m²=100²cm²
1m²=10000cm²
0,25m²=0,25×10000cm²=2500cm²
a=H√3=15√3 cm
Pp=a²=(15√3)²=675cm²
Pb=4×15√3×15=900√3cm²
Pc=2×675+900√3=1350+900√3cm²≈1350+900×1,7=1350+1530=2880cm²
proszę!!!