Jawabanmu

2014-02-10T20:30:24+07:00
d = 56 cm
r = 28 cm
L = 308 cm^2
L = phi x r^2
308 = x/360 x 22/7 x 28^2
308 = x/360 x 2464
x/360 = 308/2464
x = 308/2464 x 360 
x = 45 derajat