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b)P=1/2*8*2 1/2=10cm
a)
P=4,6*4=18,4:2=9,2
b)
P=8cm*2,5=20:2=10
a)
P=½*4,6*4
P=½*18,4
P=9,2 cm².
b)
2 i 1/2= 2,5 cm
P=½*8*2,5
P=½*20
P=10 cm².