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b = 3cm
h = 1cm
P = ½ (a+b) * h = ½ (1 + 3) * 1 = ½ * 4 * 1 = 2cm²
:):):)
b= 1cm
h= 1cm
P= 2cm2
a=1cm
b=3cm
h=1cm
P=2cm²