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16cm ×8 cm =128
obw= 10cm +10cm+10cm+6 cm=36 cm
b, c- boki
h- wysokość
h=8 cm
b=c=b=10 cm
P=128 cm²
P=½*(a+b)*h
128=½*(a+10)*8
128=4(a+10)
128=4a+40
4a=128-40
4a=88
a=22
Ob=a+b+c+d
Ob=3*10+22=52