Soal no 2. tolong ya yg bisa jawab

Juring OAB = 50 = 75/360 x luas lingkaran
luas lingkaran = (360 x 50)/75 = 18000/75 = 240
a. juring POQ = 60/360 x 240 = 40
b. luas lingkaran = 240 = pi x r^2 maka
r^2 = 240 : pi = 240 : 22/7= 240 x 7/22 = 1680/22 = 76,37 maka r = 8,74
c. luas lingkaran = 240