Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫  π  -¹ ² ³ °

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## #1 Re: Introductions » Im new here » 2011-12-20 02:58:12

Thanks guys. I feel much at home now coz im with people love what i love, who think like me. Hope we shall go far together. Chao.

## #2 Re: Help Me ! » 3-dimention » 2011-12-20 02:48:19

Can you prove me right or wrong when i say: cosAGC =(1-6h^2-2a^2)dvide by (a^2)

## #3 Re: Help Me ! » 3-dimention » 2011-12-20 02:39:37

Hi bob? I did follow your work. The last part is like ok, but how u came to get GC, i didn't get it.

## #4 Re: Help Me ! » sum of 4 digit no. » 2011-12-20 01:45:24

Hi Juan? You can form 120 four-digit different numbers. Do you now want the sum of this numbers?

## #5 Re: Introductions » Im new here » 2011-12-18 17:16:54

Thanks bobbym. I really apreciate it. Where are you located?

## #6 Introductions » Im new here » 2011-12-18 16:44:40

Psalmycole
Replies: 8

Hi guys? Wanna my friend?

## #7 Re: Help Me ! » 3-dimention » 2011-12-18 03:26:04

I need a simplified formular for this. If not so explain how i can do it.

## #8 Help Me ! » 3-dimention » 2011-12-18 03:14:39

Psalmycole
Replies: 8

What is the angle between two adjacent plans of a equilateral triangular pyramid of length 'a' and the perpendicular height of the pyramid is 'h'?

:cool: