有冇人可以教我呢條maths題
06 HKCEE MC
Q27
If the polar coordinates of the points A and B are (5,45度) and (12,135度) respectively,then the distance between A and B is?????
06 HKCEE MC
2007-04-24 1:56 am
回答 (3)
2007-04-24 2:04 am
✔ 最佳答案
@@E 條係用polar coordinate來計的首先 a (5,45度) 5係長度 唔知你有無maths text book 5b
果到有講
45度係由n (north)開始計係N45E 佢距離orgin (0,0)係5unit(長度)
相反 b 都係咁 !!唔知你明唔明=]
咁你用cos formula
a^2=5^2+12^2-2(5)(12)cos(135-45)
咁就計到ans
希望幫到你 ^^
2007-04-23 18:07:27 補充：
哈哈 sorry丫 135-45 =90你可以用 "不是定理"計!!=]
參考: 我都係會考生@@
2008-10-09 8:22 am
2007-04-24 2:09 am
135度 - 45度 = 90度
用畢氏定理 ,
AB=開方( 5^2 =12^2)
Therefore,the distance AB = 13
用畢氏定理 ,
AB=開方( 5^2 =12^2)
Therefore,the distance AB = 13
參考: Me, 06 Maths got A student
收錄日期: 2021-04-12 22:26:00
原文連結 [永久失效]:
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