角度是两个相交线或表面之间旋转的度量。它以程度（°）或弧度（rad）为单位进行测量。
1 QC = 2 OEC
1 OEC = 0.5 QC
例子:
将15 四分之一圈转换为一个八个圈：
15 QC = 30 OEC
| 四分之一圈 | 一个八个圈 |
|---|---|
| 0.01 QC | 0.02 OEC |
| 0.1 QC | 0.2 OEC |
| 1 QC | 2 OEC |
| 2 QC | 4 OEC |
| 3 QC | 6 OEC |
| 5 QC | 10 OEC |
| 10 QC | 20 OEC |
| 20 QC | 40 OEC |
| 30 QC | 60 OEC |
| 40 QC | 80 OEC |
| 50 QC | 100 OEC |
| 60 QC | 120 OEC |
| 70 QC | 140 OEC |
| 80 QC | 160 OEC |
| 90 QC | 180 OEC |
| 100 QC | 200 OEC |
| 250 QC | 500 OEC |
| 500 QC | 1,000 OEC |
| 750 QC | 1,500 OEC |
| 1000 QC | 2,000 OEC |
| 10000 QC | 20,000 OEC |
| 100000 QC | 200,000 OEC |
规则