
Topic review (newest first)
 MathsIsFun
 20050906 08:06:36
sin θ / (1 + cos θ) = tan ( θ / 2 ) For 30°: (1/2)/(1+√(3)/2) = tan 15° ==> 0.267949 = 0.267949
Yes! (at least for 30°)
 John E. Franklin
 20050906 04:09:19
A postulate can be derived from the original conversation:
sin θ / (1 + cos θ) = tan ( θ / 2 )
 MathsIsFun
 20050806 09:53:25
Yes, it is always worth while going back and revising the basics. I do it myself.
 skatergirl
 20050806 02:52:09
If you are in harder algebra try a bit prealgebra again
 MathsIsFun
 20050723 16:38:08
 ganesh
 20050723 15:59:20
Algebra is using of variables like x,y,z etc to solve mathematical problems. For example, if you have this problem #1 When 53 is added to a number, you get 70. What is the number? The solution would start this way. Let x be the number. Therefore, 53 + x = 70 x = 70  53 = 17
#2 25 added to the double of a number is 95. What is the number? Solution: Let x be the number. Therefore, 25 + 2x = 95 2x = 95  25 = 70 x = 70/2 = 35
hi i dont now a clue on algrbra can you tell me some stuff
 Thushika
 20050723 15:50:40
hi i dont now a clue on algrbra can you tell me some stuff
 ganesh
 20050721 19:17:54
mathsyperson wrote:My favourite is the one with the square made up of a slightly smaller square and 4 rightangled triangles.
And thats the only one I remember!
 MathsIsFun
 20050721 18:54:27
* collective bow with mathsyperson shoved forwards *
 GurraTedden
 20050721 18:20:10
You have both been of great help, and I'm so greatful. To MathIsFun: That was the solution I knew was there. Mathsyperson: I'm impressed! And regarding the "i want this angle so bad"; It is written by me, and have been more than true for the last 72 hours. But not any more... hihi... it's like a burden has been lifted from my shoulders, and the salvator: "www.mathisfun.com". You guys rock!
 mathsyperson
 20050721 16:32:14
My favourite is the one with the square made up of a slightly smaller square and 4 rightangled triangles. It's easily the easiest one to understand that I've found so far.
 MathsIsFun
 20050721 16:22:22
Only because I saw the symmetry  more luck than good management!
BTW, I recently saw a page with 50+ ways of proving Pythagoras, so isn't maths grand?
 mathsyperson
 20050721 16:12:24
I am extremely annoyed by the easiness of your method and hence the complete pointlessness of mine. Having said that, well done!
 MathsIsFun
 20050721 08:31:13
Another way to look at it is:
Solve a triangle that goes straight to the centre of the circle. It is a rightangled triangle, with two sides of 1m and 0.333m. That angle would be tan1(0.333/1), then double that angle for the result (by symmetry).
I figure it is 36.8°
(Gustav  are you drawing those yourself, or just adding "I want his angle so bad"? If you are, then Good Drafting!)
