Jika di ketahui luas juring OKL=51 1 3 cm² dan besar <KOL= 120 DERAJAT. PANJANG BUSUR KL ADALAH
Fitrianto
Cari jari2 luas lingkaran = 360/(besar sudut juring) x (luas juring tsb) L = 360/120 x 154/3 ................................................(154/3 = 51 1/3) L = 154
L = πr² 154 = (22/7) x r² r² = 49 r = 7
keliling linkaran = 2πr keliling linkaran = 2 x 22/7 x 7 keliling linkaran = 44
Panjang busur KL = besar sudut/360 x keliling linkaran PB KL = 120/360 x 44 PB KL = 1/3 x 44 PB KL = 44/3 atau 14 2/3 atau 14,67
luas lingkaran = 360/(besar sudut juring) x (luas juring tsb)
L = 360/120 x 154/3 ................................................(154/3 = 51 1/3)
L = 154
L = πr²
154 = (22/7) x r²
r² = 49
r = 7
keliling linkaran = 2πr
keliling linkaran = 2 x 22/7 x 7
keliling linkaran = 44
Panjang busur KL = besar sudut/360 x keliling linkaran
PB KL = 120/360 x 44
PB KL = 1/3 x 44
PB KL = 44/3 atau 14 2/3 atau 14,67