Question

More geometry help!

Answer 1

what have you done ? the nine ?

Answer 2

9 10 11 12

Answer 3

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

Answer 4

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 ?

Answer 5

yees

Answer 6

9) is the circumference of all the circle ?

Answer 7

no the circumfrence of r

Answer 8

but it's a point ??

Answer 9

sorry but if you dont know its fine!

Answer 10

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

Answer 11

it's a term for surface

Answer 12

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

Answer 13

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

Answer 14

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

Answer 15

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

Answer 16

do you know this rules, or ?

Answer 17

im confused sorry and what number

Answer 18

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

Answer 19

im confused sorry and what number

Answer 20

okay thanks a lot :0

Answer 21

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 ?

Answer 22

um

Answer 23

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

Answer 24

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

Answer 25

so now, how many do i have with 360 ?

Answer 26

um i dont know im sorry

Answer 27

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