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b)2*10*5+2*2*10+2*2*5=50+40+20=110dm
c)2*4*4+4*4*15=32+240=272cm
d)2*3*3+4*3*5=18+60=78 m
koleżanko/kolego wyżej to jest ojętość, a nie pole powierzchni
Pc = 2(2*2+2*2+2*2)
Pc = 2(4+4+4)
Pc = 24 cm²
b) Pc = 2(ab+bc+ac)
Pc = 2(2*5+5*10+2*10)
Pc = 2(10+50+20)
Pc = 160 dm²
c) Pc = 2(ab+bc+ac)
Pc = 2(4*4+4*15+4*15)
Pc = 2(16+60+60)
Pc = 272cm²
d) Pc = 2(ab+bc+ac)
Pc = 2(3*5+5*3+3*3)
Pc = 2(15+15+9)
Pc = 78m²