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y=f/2
2x-2y=2
x-y=1
x=1+y
4a=116 /:4
a=29
x²+y²=29²
(y+1)²+y²=841
y²+2y+1+y²-841=0
2y²+2y-840=0 /:2
y²+y-420=0
Δ=1+4*420=1681
√Δ=41
y=1/2*(-1+41)=20 cm
x=21 cm
e=2*21cm=42 cm
f=2*20cm=40 cm