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about 70%
about 60%
about 90%
about 80%

How do I find the probability?

basically, you need the ratio between the square, and a circle that is subscribed in it.

lets define the side of a square using s.

are of a circle is A=pi r^2

good luck....

if you have questions, you are always welcome to ask

There is no lengths or anything so im kinda confused

there is length. length for what don't you see?

radius = s/2
side of the square = diameter of the circle = s

but i dont know the side of the square or diameter of the circle to figure it out. Sorry im lost

So i make up a side length and a diameter of the circle?

Yes, that is what I showed

I denoted the length with letter s.

And now the probability of a randomly selected point, to lay on a circle is
`A(circle) ÷ A(square)`

our area of the circle is πs²/4
area of the square is s²

still confused?

so 5^2=25 and 3.14*5^2 = 78 1/2

i thought u said i do

We are just using any side-length "s" (regardless of what "s" is - of course, as long as s>0)

i know the formulas

ok, now divide the area of circle, by area of the square.

(the s² cancels on top and bottom, and you remain with ?)

pi/4?

3.14/4?

yes π/4 :)

(and again, that is regardless of the value of s, for all real values of s that are greater than 0)

okay

i did 3.14/4 = 157/200

ok so 157/250

|dw:1435286362761:dw|

what do i put for r

r can be any number you want
the 'r's will cancel, so it really doesn't matter

same with the 's's following SolomonZelman's method

so i could do 3.14*5^2/4*5^2?

yes, I guess to find the answer you can of course give the side of the square any length like 3.

or 3.14*5^2/4*2^2= 78 1/2 now what?

once you pick a number for r, you have to stick with it

and I should have used parenthesis
(pi*r^2)/(4r^2)

so (3.14*5^2)/(4*5^2)?

= 157/200

now what?

what format do they want the answer? as a fraction? or decimal?

about 70%
about 60%
about 90%
about 80%

oh ok

convert the fraction you have to a decimal
then convert that decimal to a percent

0.785

convert 0.785 to a percent

78.5%

about 80%?

correct

well that was confusing lol thanku

whats a minor arc in a circle?

http://mathworld.wolfram.com/MinorArc.html
any arc that is smaller than 180 degrees

an arc is just a piece of the whole circumference

ok so it be PS?

that's one minor arc

MY CHOICES: PS, SO, SQ, PSR

the others didnt look right

yeah PS is the only minor arc
SO isn't even an arc (it's a radius)

thats what i thought