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a) L= 3+3+9+3+3+6+3+3+9+3+3+6= 54[m]
P= 3*3+3*12+3*12+3*3= 9+36+36+9=90[m²]
b) L=6+5+5+4+7+3+4+5=39[m]
P= 5*6+5*1+3*7=30+5+21=56[m]
12)
P1= 50*142=7100 [cm²]
P2= 7100-(3*2*50) -(2*142) = 7100-300-284= 7100-584=6516 [cm²]
7100-6516= 584
Odp. Powierzchnia jest mniejsza o 584[cm²]