Question

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Answer 1

@rational
@AkashdeepDeb

Answer 2

please explain here

Answer 3

As a hardcore radian activist, the area of sector needs to be :

\[\large \text{Area of a sector} = \frac{\theta}{2\pi }\times \pi r^2 \]

Answer 4

plugin the given values,
solve the unknown

Answer 5

i thought it will be
\[\frac{ \pi r^2 \Theta }{2 }\]

Answer 6

\(\pi\) cancels out
but i prefer remembering it in terms of actual area of full circle instead of blindly memorize some other unrelated formula

Answer 7

that makes more sense

Answer 8

i agree

Answer 9

\[\large \text{Area of a sector} = \frac{\theta}{2\pi }\times \pi r^2 \]


Notice that \(\pi\) cances out and gives you the formula which you have attached earlier

Answer 10

@AkashdeepDeb explain here,leave that other page

ok...i will check out the videos...that page has just been spoiled by those people. but at least i have understood everything you have said

Answer 11

the formula will be different mine will have on pi but your will have no pi

Answer 12

you don't have pi either, check again

Answer 13

ooh yeah lol....you are right!

Answer 14

As I said before,

radians = arc length / radius.
So when arc length = radius.
The angle covered is 1 radian.



Now, what is the arc length of the whole circle?
Well, it is the circumference, isn't it? :D



So, we can bring out a simple relation.

\[2 \pi ~~~radians = 360 ~~~degrees\]

Getting this? :)

Answer 15

i never saw it that way... nice!

Answer 16

look at this one now...im posting it up in a sec

Answer 17

how do you know if you should find radians or degrees?

Answer 18

Your choice. Finding radians is more (in-a-way) professional as degrees become obsolete after a while in higher grades.

Answer 19

when I ask you : `whats your height ?`,
how would u know that I am asking it in feet/cm/kilometer ?

Answer 20

haha! its all same :
6 feet = 183cm = 0.00183 km

it doesn't matter how you specify ur answer mathematically - but clearly feet/cm looks more appropriate here ?

Answer 21

@rational i would answer in metres because it is the SI unit
@AkashdeepDeb i found in degreed but it said i am wrong and was supposed to find in radians

Answer 22

degree

Answer 23

Exactly! Find it in radians from now!

Answer 24

oooooh noooooooooooooo.... :(

Answer 25

im scared of radians lol