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1. ### the radii of the two circles

Let radius of the inner circle be r, by cosine rule A^2 = r^2 + r^2 - 2(r)(r) cos (22.5... the obtuse angle = 67.5 + 60 = 127.5. Let radius of outer circle be R, by sine rule R/sin 127.5 = A/sin 22.5...

分類：科學及數學 > 數學 2012年03月27日

2. ### maths problems( urgent!! )

1) Let radius of inner circle = r, so circumference = 2pr , where p = pi Radius of outer circle will be ( r + 1... independent of r, that means no matter what is the radius of the circles , different in length will be 2p meters if they are 1m apart. 2) ...

分類：科學及數學 > 數學 2009年11月16日

3. ### Maths(Volume and surface area of a cylinder2) 20marks=D

... circle = radius^2 x 3.14 So outer circle = (0.3/2)^2 x 3.14 = 0.071m^2 Inner circle = (0.22/2)^2 x 3.14 = 0.038m^2 And then outer – inner = 0.033m^2...

4. ### maths! maths! maths!

... of a complete outer circle = π(15)2 = 225π Area of a complete inner circle = π(9)2 = 81π Area of a complete ring = 225π – 81π = 144&pi...

分類：科學及數學 > 數學 2009年08月17日

5. ### Confusions about electrons as a wave. (A bit long and stupid. Thanks you so much for taking time to see)?

... a simple circle . It becomes an annulus, i.e. bounded an inner circle and an outer circles , with the electron found within these two circles ...

分類：科學及數學 > 物理學 2017年02月07日

6. ### MATH PROBLEM!

... of Outside or middle circle ) 2y - x = 25 (Sum of inner circle ) Solving the equation, x = 23/3, and y = 49/3 As the question ...

分類：科學及數學 > 數學 2007年05月16日

7. ### 求片中background music

分類：電視 > 其他 - 電視 2012年03月13日

8. ### 怎畫三角形內心

圖片參考：http://webcai.math.fcu.edu.tw/geometric/ circle / inner /img/inner1.gif 三角形 ABC , AQ 平分 ∠A , BR 平分...

9. ### 旋轉式溫度計PHY

...due to its longer length than that of iron after expansion) and iron on the inner circle .

10. ### Circumference of circles

Let w m be the width, r m be the inner radius 2π(r+w)-2πr=60 2πr-2πr+2πw=60 w=60/(2π) =9.55(cor.to3sig.fig.) Therefore, the width is 9.55m.

分類：科學及數學 > 數學 2009年06月07日

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