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a)
P = a²
P = 8²
P = 64 cm²
b)
bok I = a
bok II = d
d = a√2 = 8√2
P = 8*8√2
P = 64√2 cm²
c)
trójkąt równoboczny o boku = d
d = a√2
d = 8√2
P = d²√3/4
P = (8√2)²√3/4
P = 64*2√3/4
P = 128√3/4
P = 32√3 cm²
d)
a = 8 cm
b = 9 cm
P = 8*9
P = 72 cm²