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a=8cm
b=12cm
h=4,5cm
P=(a+b)h/2
P=(8+12)*4,5/2 =20*4,5/2 =10*4,5
P=45cm²
2.
a=12cm
b=12+2=14cm
O=36cm
O=a+b+2c
12+14+2c=36
2c=36-26
c=10:2
c=5cm dlugość ramienia