Zadanie
a = 8 dm
b = 9 dm
c = 10 dm
Pc = 2ab + 2ac + 2bc
Pc = 2 · 8 · 9 + 2 · 8 · 10 + 2 · 9 · 10 = 16 · 9 + 16 · 10 + 18 · 10 = 144 + 160 + 180 =
= 484 dm²
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Zadanie
a = 8 dm
b = 9 dm
c = 10 dm
Pc = 2ab + 2ac + 2bc
Pc = 2 · 8 · 9 + 2 · 8 · 10 + 2 · 9 · 10 = 16 · 9 + 16 · 10 + 18 · 10 = 144 + 160 + 180 =
= 484 dm²