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= phi x r x r
= 3,14 x 10 x 10
= 314 cm^2
luas juring/luas lingkaran = sudut pusat/sudut lingkaran
3,14/314 = sudut pusat/360
1/100 = sudut pusat/360
sudut pusat = 360/100
sudut pusat = 3,6 derajat
3,14 = sp/360 x luas lingkaran (3,14 x 10 x 10= 314 cm2)
sp = 3,14 x 360 / 314 = 3,6 derajat
maaf klo salah