Question

in my country's education system, we were taught NOTHING on radians. I will be majoring in math soon and i need to master stuff with radians in it and it seem sooo hard to me. does someone care to explain to mean basics like what is a radian and any other useful info, please?

Answer 1

http://i.imgur.com/WbJwn5J.gif

Answer 2

>.<
i dont remember any radian in univ though

Answer 3

nice!!! @rational

Answer 4

there is some stuff i need to have completed before we start calculus...and its the only part remaining @BSwan

Answer 5

its like math basics generaly, not necesarily related to calculus @BSwan

Answer 6

`radian` is simply a measuring unit like meter or foot or degrees

Answer 7

how many degrees=1radian?

Answer 8

like u measure distance in meters,
u can measure angle in radians

Answer 9

don't jump to the relationship between radians and degrees yet,
first convince urself on how many radians a complete circle makes

Answer 10

whats the formula for circumference of a circle ?

Answer 11

so degrees and radians have no relation whatsover.
I already got that part @rational but when getting are is where i am confused. when you have been given radians

Answer 12

oh , today i had this argument , when i had calcules 1 i took A , cuz every thing seems to be repeated from high school , but now i just relalized that calcules 1 added nothing to my knowleged , instead it make all the rusty stuff in head , if time come back , i will study it on my own >.<
so be carfull and be creative in it

Answer 13

:O

Answer 14

my bro told me the same thing..told me to jump to calculus II or some other thing...but i decided to just start fresh

Answer 15

how do i find area when given radians @rational

Answer 16

http://4.bp.blogspot.com/-pNbCrmswLl0/UDPKcDhmHkI/AAAAAAAAcFg/Dc5XzaoayQc/s1600/529094_3861032277260_1832540587_n.jpg

Answer 17

no no im not saying jump to calc 2 :O
(big mistake ) also its not allowed in major sheet :P
im saying to not rely on ur teacher :O be creative in studing it , also read more that one resource :O

Answer 18

lmao @rational TRUE!!!!!!!

Answer 19

you should get use to angle in radians,
radians is more natural than degrees

Answer 20

what is given in radians ?
and what area u want to find ?

Answer 21

@BSwan i had an option to do so coz aparently im too good in math....so said the college guys. we are using this aleks site...i dont realy get their explanations on that particular topic of radians

Answer 22

is there a basic formula for finding area of a sector of a circle when given radians... @rational

Answer 23

yeah do you know the circle area ?

Answer 24

well you know that "circumference = 2pi radians"
use it to find the area of circle

Answer 25

an angle of "2pi radians" creates an area of "pi r^2"
so how much area an angle of "\(\theta\)" would make ?

Answer 26

ok...say for example radius if 7 and you have also been given \[3\pi radians\]

Answer 27

for example :-

Answer 28

Area of sector of \(\theta ~radians\) :

\[\huge \pi r^2 \times \dfrac{\theta }{2\pi}\]

Answer 29

wont pi and pi cancel?

Answer 30

they will cancel, but i like remembering above form because it helps you see clearly how you scaling the original area based on angle

Answer 31

oooh, ok i guess i will jus have to do practice questions on the same then