luas juring OAB=50cm luas sudut AOB=75° luas sudut POQ= 60° hitunglah: a.luas juring POQ b.jari jari lingkaran c.luas lingkaran

a. juring poq/juring aob = <poq/<aob
juring poq/50 = 60/75
75 juring poq = 3000
juring poq = 3000/75
juring poq = 40 cm

b. juring aob = <aob/360 . πr²
50 = 75/360 . 3,14 . r²
18.000 = 235,5 . r²
r² = 18.000/235,5 = 76,43
r =
[tex]76.43[/tex]
r = 8,74 cm

c. L = πr²
= 3.14 . 8,74 . 8,74
= 239,99 cm²