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a) sudut AOB
L juring AOB = 25
x/360 . L lingkaran = 25
x/360 . 100 = 25
100x = 25 . 360
100x = 9000
x = 90
jawabannya 90 derajat
b) keliling lingkaran
25/100 = 17/x
1/4 = 17/x
x = 4 . 17
x = 68
jawabannya 68 cm
a.25/100 -> 1/4 x 360 = 90°
b.1/4 = 17
1 = x
x = 1 x 17 : 1/4
x = 17 x 4
x = 68 cm
keliling -> 68 cm