More geometry help!

what have you done ? the nine ?

9 10 11 12

okay i m french, so TRS means the angle ? ( i ve not the same notation :) )

okay i think so, so : i don't think you can prove the formula, so you must have been told that a circle has a 2*pi*R circumference right ?

yees

9) is the circumference of all the circle ?

no the circumfrence of r

but it's a point ??

sorry but if you dont know its fine!

no, that's not it :) a point can't have a circumference :/

it's a term for surface

because after that they ask you the area, and with the data you have R must be the circle which center is R

okay so whats the anwser or how do you do this?

the answer is : for an angle of 126° you've 12 pi the angle of the circle is 360 so you've :

(it's 40 pi) because if for 126 you've 14 pi, then for 360 you've 360 *14/126 pi

do you know this rules, or ?

im confused sorry and what number

for the 9 it's 40 pi. I've to think a little in order to explain it :)

im confused sorry and what number

okay thanks a lot :0

that's ok ;p So, we have an area of 35 pi for the 126°, so which area can we have with a 360 angle ?

um

the easier reasoning is : what do i have for 1 ° ?

i have 35 pi / 126 because for 126 ° i have 35 pi

so now, how many do i have with 360 ?

um i dont know im sorry

if you know for 1 ° the area, you can sum all of the area ang get whichever area you want

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