# Math Is Fun Forum

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

You are not logged in.

## #6 Re: Exercises » Compute the solution: » 2021-10-24 11:48:19

Long time no see, ganesh.

## #11 Re: Ganesh's Puzzles » Oral puzzles » 2021-09-02 12:51:05

Don't mind me, just trying to get my posts up

## #12 Re: Exercises » Compute the solution: » 2021-09-02 12:37:24

qwertyuiopasdfghjklzxcvbnm

## #13 Re: Ganesh's Puzzles » Oral puzzles » 2021-08-31 12:06:03

ahsfhusoahfusdfuiohanojgerpbzcxcxbnxc

:flushed:

tysm bob <3

## #17 Re: Exercises » Compute the solution: » 2021-08-30 11:58:31

I'm really bad at these type of questions but I'll give it a try since I have nothing else to do

## #18 Re: Help Me ! » help omg :'( » 2021-08-29 23:26:36

Thank you bob!!! this might sound a bit weird but could you write out the solution step-by-step all the way to the end? I'm having a bit of trouble understanding why the numerator is -2a.

## #19 This is Cool » Found something called a salinon :o » 2021-08-29 14:23:44

XaiDiv
Replies: 0

ok so basically i found this thing called 'Archimedes' salinon'
(salinon means salt bowl in Greek btw.)
so this is what salt bowls looked like in BC 200?

The area of the salinon (shaded red) is surprisingly equal to the area of the circle shaded in blue!

Let's say the radius of the two big semicircles is r1, and the radius of the small one is r2. (Let's also define O as the area of the giant semicircle, O1 and O2 as the area of the two big semicircles, and O3 as the area of the smallest one.)
Then, the area of the salinon (S) is:

r1 + r2 is the radius of the blue circle, so the area of the salinon is EQUAL to the area of the circle!

## #20 Help Me ! » help omg :'( » 2021-08-29 13:38:28

XaiDiv
Replies: 4

hey guys, how can I calculate the value of

√(1-a) / √(1+a) - √(1+a) / √(1-a) ?

(a = 1 / √5 fyi.)

## #21 Introductions » New member!!11!!1 :O » 2021-08-22 13:27:53

XaiDiv
Replies: 2

Hey!!!!! :)

I'm XaiDiv, an 8th grader math buff who likes to study and make friends!
I'm from South Korea (yes I'm a bilingual lol) but I'm fluent @ speaking English B)
Feel free to talk to me when you want to make friends :)))))