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 = 1 qtr
1 qtr = 1 QC
例子:
将15 四分之一圈转换为象限：
15 QC = 15 qtr
| 四分之一圈 | 象限 |
|---|---|
| 0.01 QC | 0.01 qtr |
| 0.1 QC | 0.1 qtr |
| 1 QC | 1 qtr |
| 2 QC | 2 qtr |
| 3 QC | 3 qtr |
| 5 QC | 5 qtr |
| 10 QC | 10 qtr |
| 20 QC | 20 qtr |
| 30 QC | 30 qtr |
| 40 QC | 40 qtr |
| 50 QC | 50 qtr |
| 60 QC | 60 qtr |
| 70 QC | 70 qtr |
| 80 QC | 80 qtr |
| 90 QC | 90 qtr |
| 100 QC | 100 qtr |
| 250 QC | 250 qtr |
| 500 QC | 500 qtr |
| 750 QC | 750 qtr |
| 1000 QC | 1,000 qtr |
| 10000 QC | 10,000 qtr |
| 100000 QC | 100,000 qtr |
规则