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L. arsir=L. segi4-1/2L. o-L. segi3
L. segi3=1/2. 20. 8
= 80
1/2Lo=1/2 πr^2=1/2 . 3,14 . 10 . 10
=157
L. segi4= s.s=20.20=400
Larsiran= 400-157-80
=163