tolong dijawab y besrta caranya

1.
r1= 28, r2 = (28+14) = 42
luas arsiran = 45/360 x π x r2² - 45/360 x π x r1²
L = 1/8 x 22/7 x (42² - 28²)
L = 11/28 (980) = 385 cm²

2.
<OPQ = <OQP = 40
<POQ = 180 - <OPQ - <OQP = 180 - 40 - 40= 100
<PRQ = 1/2  <POQ = 1/2 (100) = 50

<PRQ + <OQR + <OQP +<OPQ + <RPO = 180
50 + 15 + 40 + 40 + <RPO = 180
145 + <RPO = 180
<RPOO = 180-145= 35

3. <CAO = 1/2 <BOC  = 1/2 (62) = 31