Q8.The point R,T and U lie on a circe that has radius 4. If the length of arc RTU is 4派/3,What is the length of the line segment RU?
A. 4/3 B.8/3 C.3 D.4 E.6
不记得圆的知识了,请教大家这个题目的解法。
Q10. DS题 What is the value of (X-Y)4次方?
1) the product of x AND y is 7
2)x and y are integers
谢谢XDJM了
举报
弧长=圆心角/2PAI MULTIPLE 圆周长 圆心角=PAI/3 =60度 所以RU=半径=4
选C 1)单独不能解题 2)也不可能
1)+2)得X,Y分别为1和7,所以可求(X-Y)4次方
====不明白,圆心角=PAI/3 =60度 何以得出 RU=半径=4,PLS HELP...
谢谢了
arc RTU的长度是4派/3
整个圆的周长是2派r=8派
arcRTU的长度是整个圆周长的1/6,所以arcRTU对应的圆心角的度数是圆周(2派)的1/6,即派/3,就是60度。如图,这是个等边三角形
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谢谢charmant的图,清楚明了
There's no mention of the origin. How do we know if one of the P T U lies on the origin? My understanding from the question is: TRU lies on a circle, and this circle has r=4.
Please let me know.
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