Timeline for How to express the angle between altitudes of parallelogram to its adjacent sides in terms of angles of this parallelogram?
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| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Aug 15, 2024 at 17:01 | vote | accept | Rusurano | ||
| Aug 10, 2024 at 12:23 | answer | added | RobinSparrow | timeline score: 2 | |
| Aug 10, 2024 at 8:53 | comment | added | Feng | $\angle DHH_1+\angle H_1HH_2=180^\circ$, and in quadrilateral $AH_1HH_2$ we have $\angle A+\angle AH_1H+\angle H_1HH_2+\angle AH_2H=360^\circ$, hence $\angle A+\angle H_1HH_2=180^\circ$. Therefore, $\angle DHH_1=\angle A$. | |
| Aug 10, 2024 at 8:52 | comment | added | peterwhy | $\angle HDH_1 = 90^\circ -\angle A$, $\angle DHH_1 = 90^\circ -\angle HDH_1$. | |
| Aug 10, 2024 at 8:46 | history | asked | Rusurano | CC BY-SA 4.0 |