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l=h+3
h=h
5² + h²=(h+3)²
25 + h²= h²+6h+9
25-9=h²-h²+6h
16=6h/ :6
h=2,7cm
P=πr(r+l)
p=3,14*5(5+5,7)
P=15,7*10,7
P=1847,89cm²≈1848cm²