You are Here: Home >< Maths

# Help ASAP Circular Measure AS lvl

Announcements Posted on
Last day to win £100 of Amazon vouchers - don't miss out! Take our quick survey to enter 24-10-2016
1. help with this question pls. working and explanation please..
2. (Original post by Snowie9)
help with this question pls. working and explanation please..
Let equal the radius. You can work out the sector area of COB by applying the formula from C2. We can call this area .

Next we need to find the area of the minor segment cut off by AC. We can apply the same formula with the angle being and find the area of the sector COA, lets call this area . In order to find the minor segment area, we need to subtract the area of the triangle away from the sector. You can work out the area of the triangle from the formula involving sine, call this area . Do to get your minor segment. Once you have the area of the minor segment, let's call it , you can say that from the information you are given.

The a's should cancel everywhere and you should rearrange to get your required answer. Remember that
3. Well, what have you tried? What are your thoughts? Anything?
4. My result was pie - delta + sin delta = delta
5. (Original post by Snowie9)
My result was pie - delta + sin delta = delta
is now 'pie' is it?

But really, post your working out for us to check.
6. (Original post by Snowie9)
My result was pie - delta + sin delta = delta
Sounds like you're roughly on the right track, with a slip up somewhere. How'd you get that? (I can't read minds)
7. (Original post by Snowie9)
I got (\pi-\theta) sin(\pi-\theta) = (\theta)
Close. Show us your working out so I can see where you might've slipped up.
8. This is my working. Sorry I'm new to this website and I don't know how stuff works haha. By the way how do u type the pi ( sorry for the pie) symbols. thanks!!
9. (Original post by Snowie9)
This is my working. Sorry I'm new to this website and I don't know how stuff works haha. By the way how do u type the pi ( sorry for the pie) symbols. thanks!!
Don't worry about it. Very good work so far. Mistake on the last line. You have

Multiply everything by two:

Your mistake was mutliplying the LHS by two but forgetting about the RHS, your factors of disappeared without the on the right changing to ,
10. (Original post by Snowie9)
This is my working. Sorry I'm new to this website and I don't know how stuff works haha. By the way how do u type the pi ( sorry for the pie) symbols. thanks!!
Last two lines; you forgot to multiply the right hand side by 2.

To use mathematical writing on this site, refer here: http://www.thestudentroom.co.uk/wiki/LaTex
11. 11b, I can't seem to find the correct answer which is 53cm^2
12. (Original post by Snowie9)
11b, I can't seem to find the correct answer which is 53cm^2
13. (Original post by Snowie9)
11b, I can't seem to find the correct answer which is 53cm^2
Show us what you've tried.
14. omg thanks guys! didn't notice about my mistake on that.. thankssss😄😄
15. (Original post by Snowie9)
omg thanks guys! didn't notice about my mistake on that.. thankssss😄😄
No worries. It was just a silly mistake, happens to everybody.
16. my working

## 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: July 31, 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