Activity for Ryo TAKA
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Edit | Post #296167 |
Post edited: |
— | 4 months ago |
| Edit | Post #296167 |
Post edited: |
— | 4 months ago |
| Edit | Post #296167 |
Post edited: |
— | 4 months ago |
| Edit | Post #296167 | Initial revision | — | 4 months ago |
| Question | — |
Area of a (planar) quadrilateral using two opposite sides and four angles I guessed the following area formula for a (planar) quadrilateral using two opposite sides and four angles:(When $a=AB$ and $c=CD$,) $S = \frac{a^2}{2(\cot A + \cot B)} + \frac{c^2}{2(\cot C + \cot D)}$ This formula can be applied to the quadrilateral satisfying $A+B \ne \pi$ and $C+D \ne \... (more) |
— | 4 months ago |