bantu jawab no.27-19 ya yg bisa. Makasih

27) d = 14 => r = 7
Luas juring = 72°/360° x πr^2 = 1/5 x 22/7 x 7 x 7 = 154/5 = 30 4/5 cm^2

28) <ACB = <ADB = 65° (sudut keliling yg menghadap busur yg sama)
<CEB = 180° - (<ACB + <CBD) = 180° - (65° + 42°) = 180° - 107° = 73°
<CED = 180° - <CEB = 180° - 73° = 107°

29) <APB = <AQB = <ARB = x (sudut keliling yg menghadap busur yg sama)
<APB + <AQB + <ARB = 144°
x + x + x = 144
3x = 144
x = 48
<AOB = 2 <AQB = 2(48) = 96°