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<RPS = PBusur RS
40 = x ----------------> dikali silang
100 40
1600 = 100 x
16 cm = x
2. <AOC = LJuring AOC
<BOC LJuring BOC
120 = x -----------> 60 karena berpelurus dengan 120°
60 36
4320 = 60x
72 cm² = x
3. <POR = PBusur PR
<ROS PBusur RS
100 - <ROS = 54
<ROS 36
3600 - 36<ROS = 54<ROS
3600 = 36<ROS + 54 <ROS
3600 = 90<ROS
40° = <ROS
PBusur RS = 36 bila sudut 40°
maka keliling lingkaran yang sudutnya 360° (dengan perbandingan 9)
= 36 × 9
= 324 cm