Diketahui panjang jari jari suatu lingkaran 10cm, dan besar sudut AOB 60° ,maka luas juring AOB adalah .... A.107,4 B.104,7 C.62,3 D.21,3

Bab Lingkaran
Matematika SMP Kelas VIII

luas juring = a/360° x π x r x r
luas juring = 60°/360° x 3,14 x 10 x 10
luas juring = 52,33°

[tex]\displaystyle\left[\text{AOB}\right]=\frac{\theta}{360^\circ}\pi r^2\\\left[\text{AOB}\right]=\frac{60^\circ}{360^\circ}\pi10^2\\\left[\text{AOB}\right]=\frac{100}{6}\pi\\\boxed{\boxed{\left[\text{AOB}\right]=52,35}}[/tex]