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Dane
Pc=8,64dm²=864mm²
Szukane
a=?
W decymetrach
Pc=6a²
8,64=6a²
a²=8,64÷6
a²=1,44
a=1,2dm
W milimetrach
Pc=6a²
864=6a²
a²=864÷6
a²=144
a²=12mm
zad2
Dane
a=2dm=20cm
b=5,8cm
H=45mm=4,5cm
Szukane
Pc=?
Pc=2ab+2aH+2bH
Pc=232+180+52,2=464,2cm²
Pc=464,2cm²