![](https://cache.ptt.cc/c/https/i.imgur.com/Buzw6u1l.jpg?e=1718257334&s=ARg6IH76aa0B51Slr9bTcw)
![](https://cache.ptt.cc/c/https/i.imgur.com/xWGY48Cl.jpg?e=1718232082&s=qeRwZ5hC97659sCI7rHxgA)
推 tyz : 四邊形對角互補是要有外接圓的條件吧? 07/02 11:27
→ hiplus : ∠ABC=∠ACE 對同弧(∠ABC圓周角,∠ACE弦切角) 07/02 11:46
→ hiplus : ∠ABD=∠ADE 對同弧(∠ABD圓周角,∠ADE弦切角) 07/02 11:46
→ hiplus : △ACD中,∠ACE+∠ADE+∠CED=1800 07/02 11:47
→ hiplus : ∠ABC+∠ABD=∠ACE+∠ADE 07/02 11:47
→ Ricestone : 15度 07/02 12:12
推 tyz : to h大 了解 我誤會了~ 07/02 12:19