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d₂=15cm
P= (d₁*d₂) / 2
P= (8*15 ) /2 = 120/2 = 60
P= a *h
a*h=60
h= 7 1/17 = 120/17
a * 120/17 = 60
a= 60 * 17/120 = 8,5
O=4a
O= 4*8,5 = 34cm