請依下圖列出所有步驟及理據(如:int. angles, PQ//SR)等
圖:http://i246.photobucket.com/albums/gg119/FFS12/ABC32.jpg
英文四邊形數學題9(10分)
2009-02-03 1:40 am
回答 (1)
2009-02-03 1:56 am
✔ 最佳答案
AB=CD (prop. of rect.)so,
CD=4cm
CD=EA (opp. sides of //gram)
so,
EA=4cm
DE² = AE² + AD² (Pyth. thm)
DE² = 4² + 3²
DE = √25
DE = 5cm
DE=AC (opp. sides of //gram)
so, AC=5cm
the perimeter of ACDE
= 4×2 + 5×2
= 8+10
= 18cm
參考: me
收錄日期: 2021-04-23 20:18:10
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090202000051KK01721