You are Here: Home >< Maths

# Area Of Sectors Help please. Watch

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 ^^

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:
Updated: May 27, 2016
Today on TSR

### What is the latest you've left an assignment

And actually passed?

### Simply having a wonderful Christmas time...

Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• Poll
Useful resources

## Make your revision easier

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams

Can you help? Study help unanswered threads

## Groups associated with this forum:

View associated groups
Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.