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α=27 miara kata srodkowego
r=12.5=25/2
l=α/360*2πr dl. luku
l=πr*α/180 (po skroceniu przez 2)
l=(22/7)*(25/2)*(27/180)
l=(11/7)*25*(3/20)
l=(11/7)*5*(3/4)
l=165/28
l=5 i(25/28)
P=πr²*α/360 pole wycinka kolwego
P=(22/7)*(25/2)²*(27/360)
P=(22/7)*(625/4)*(3/40)
P=(11/7)*(125/2)*(3/8)
P=4125/112
P=36 i 93/112