一個等邊三角形,周界240cm,面積係2800cm,問高係幾多.
唔係功課黎,我唔係想抄課,幫下我啦,thx.
數學問題...........help me!!!!!!!
2007-05-15 4:11 am
回答 (3)
2007-05-15 4:20 am
✔ 最佳答案
由於係等邊三角形，所以240/3，邊長就係80cm。三角形的面積係：底乘高除2
設高係 y cm,
80y/2=2800
80y =5600
y=70cm
2007-05-15 4:22 am
2800×2÷(240÷3)
=2800×2÷80
=5600÷80
=70
=2800×2÷80
=5600÷80
=70
收錄日期: 2021-04-13 17:20:20
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070514000051KK04079