You are Here: Home >< Maths

# Area Of Sectors Help please.

Announcements Posted on
TSR's new app is coming! Sign up here to try it first >> 17-10-2016
1. I know you do the angle divided by 360 then multiply by pir^2 like this http://prntscr.com/b976e6

but then why don't we do the same on this one

http://prntscr.com/b9771m

on that, we do the angle divided by 360 just like the first one but we don't multiply by pir^2 instead they multiply 2(pi)(12)

Help would be much-appreciated thanks.
2. (Original post by junayd1998)
I know you do the angle divided by 360 then multiply by pir^2 like this http://prntscr.com/b976e6

but then why don't we do the same on this one

http://prntscr.com/b9771m

on that, we do the angle divided by 360 just like the first one but we don't multiply by pir^2 instead they multiply 2(pi)(12)

Help would be much-appreciated thanks.
Do you understand the difference between length and area? Read the question again.
3. (Original post by Zacken)
Do you understand the difference between length and area? Read the question again.
Oh **** im so clueless, my bad how do you find the length then? Area not a problem.
4. (Original post by junayd1998)
Oh **** im so clueless, my bad how do you find the length then? Area not a problem.
(Angle / 360) * circumference of whole circle.
5. (Original post by junayd1998)
Oh **** im so clueless, my bad how do you find the length then? Area not a problem.
You find the length of an arc by multiplying the radius by theta (angle)
6. (Original post by Zacken)
(Angle / 360) * circumference of whole circle.
Thank you.
7. (Original post by junayd1998)
Thank you.
there r two formulas
1. area of a sector: angle/360 x pie x r²
2.arc length:angle/360 x 2 x pie x r
u just have to know the right place to use them!!!!
8. (Original post by shahida sulaiman)
there r two formulas
1. area of a sector: angle/360 x pie x r²
2.arc length:angle/360 x 2 x pie x r
u just have to know the right place to use them!!!!
Yeah, thanks!
9. (Original post by junayd1998)
Yeah, thanks!
ur welcome ^^

## Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank
2. this can't be left blank
3. this can't be left blank

6 characters or longer with both numbers and letters is safer

4. this can't be left empty
1. Oops, you need to agree to our Ts&Cs to register

Updated: May 27, 2016
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Today on TSR

### How does exam reform affect you?

From GCSE to A level, it's all changing

Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read here first

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams