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H=10cm
1)Ppk=20cm*20cm=400cm^2
2)Pc=?
Pc=2*(4cm*4cm)+4*(4cm*10cm)= 2*16+4*40=32+160=192cm^2
3) 192cm^2 * 100% / 400cm^2 = 19200/400 % = 192/4 % = 48%
cm^2 --- centymetr kwadratowy
^ --- potęga
2. 2*16 + 4*4*10 = 32 + 160 = 192 cm^2
3. 100% - 400 cm^2
x% - 192 cm^2
400x = 19200
x =48%