一條長1m的彩帶可圍繞一個圓形禮盒兩個圈。該禮盒的直徑是多少？
點計，列埋條式比我呀，唔該晒！
一條中2數學題~{關於圓形}
2008-06-20 6:09 am
回答 (4)
2008-06-20 11:30 am
✔ 最佳答案
gift box's circumference: 0.5mcircumference = 2TTr (TT=3.1416) (r=radius)
2TTr = 0.5m
r= 0.5m/(2x3.1416)
r=0.5m/6.28
r=0.0796m
diameter= 0.159 m
2008-06-22 5:16 am
The circumference of the box = 1m / 2
= 0.5 m
Let x be the diameter of the box.
2xπ = 0.5
x = 0.159 (to 3 sig. fig.)
∴ the diameter of the box is 0.159m.
= 0.5 m
Let x be the diameter of the box.
2xπ = 0.5
x = 0.159 (to 3 sig. fig.)
∴ the diameter of the box is 0.159m.
參考: myself
2008-06-21 3:47 am
2πr=0.5m
6.28r=0.5m
0.5m
r= ------
6.28
r=0.0796
0.0796x2=0.159
直徑=0.159
6.28r=0.5m
0.5m
r= ------
6.28
r=0.0796
0.0796x2=0.159
直徑=0.159
參考: ME
2008-06-20 6:20 am
設直徑為d。
2dπ=1
d=1/(2π)
d≒0.159
2008-06-19 22:21:37 補充：
∴設直徑是0.159m
2dπ=1
d=1/(2π)
d≒0.159
2008-06-19 22:21:37 補充：
∴設直徑是0.159m
收錄日期: 2021-04-23 20:33:52
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080619000051KK02785