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d1 = 4,6 cm
d2 = 4,6cm
P = 1/2 x 4,6 x 4,6 = 10,58 cm2
d=a√2
a√2=4,6cm
a=4,6cm/√2
a=2,3√2cm
P=a²
P=(2,3√2cm)²
P=10,58cm²