Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °
You are not logged in.
Post a reply
Topic review (newest first)
- kylekatarn
- 2005-08-14 10:37:51
I got nothing till' now.
But I'll keep on trying for shure
- wcy
- 2005-08-13 21:08:40
can someone pls help me with this question, i am stuck at it for weeks
- wcy
- 2005-08-08 15:32:00
i have some trouble proving this vector question:
The points A,B,C,D have position vectors a, b, c, d with respect to the origin O. The position vector m, of M on AC such that xAM=yMC, where x+y=1.
Show that if A,B,C,D are points on a sphere, centered at O, and if AC meets BD at M, where x¹BM=y¹MD with x¹+y¹=1, then
xy|a-c|²=x¹y¹|b-d|²
(bolded letters are vectors)