- $$\tan \theta = \frac{{\sum {\text{H}} }}{{\sum {\text{V}} }}$$
- $$\tan \theta = \frac{{\sum {\text{V}} }}{{\sum {\text{H}} }}$$
- $$\tan \theta = \sum {{\text{V}} \times \sum {\text{H}} } $$
- $$\tan \theta = \sqrt {\sum {{\text{V}} + \sum {\text{H}} } } $$
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