Nomor 29&30 caranya gimana ya? Tolong dibantu, makasih:)

29. Rumus busur lingkaran: [tex] \alpha [/tex] / 360 x 2[tex] \pi [/tex]r

Busur AB = 40/360 x 2 x 22/7 x r
28 = 1/9 x 2 x 22/7 x r
r = 40cm

Busur BC = 150/360 x 2 x 22/7 x 40 = 5/12 x 2 x 22/7 x 40 = 104.76 cm = 105 cm

30. PRQ = 35°