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ob= 2a+2b
a=18,5cm
b=18,5x0,2 =3,7cm
p= 18,5x3,7= 68,45cm
ob=2x18,5+2x3,7=37+7,4=44,4
b= 18,5*0,2
b= 3,7
P= ab = 3,7*18,5= 68,45 cm²
Obw = 2a + 2b= 2*18,5 + 2*3,7= 44,4 cm