Tolong dong di bantu pake caranya ya besok dikumpul nih ^_^ Diketahui luas suatu juring 64 1/6 cm² dan jari-jari lingkaran 7 cm. Hitunglah: a) besar sudut pusat juring tersebut b) panjang busur juring
indirakusuma
Luas juring = x/360 πr² 64 1/6 = x/360 x 22/7 x 7² 385/6 = x/360 x 154 6.154.x =385.360 924x = 138.600 x = 138.600/924 x = 150°
Panjang busur = 150/360 x 2.π.r = 150/360 x 2 x 22/7 x 7 = 18,3 cm = 18 1/3 cm
64 1/6 = x/360 x 22/7 x 7²
385/6 = x/360 x 154
6.154.x =385.360
924x = 138.600
x = 138.600/924
x = 150°
Panjang busur = 150/360 x 2.π.r = 150/360 x 2 x 22/7 x 7 = 18,3 cm = 18 1/3 cm