You are Here: Home >< Maths

1. Arc AB of circle centre O has radius r and angle of 0.5 Radians. Given the perimeter of AOB is 30 find r.

how do I do this, the answer should be 12 but I keep getting 1.04 which is way off.

2. (Original post by Student21)
Arc AB of circle centre O has radius r and angle of 0.5 Radians. Given the perimeter of AOB is 30 find r.

how do I do this, the answer should be 12 but I keep getting 1.04 which is way off.

where theta is the angle and a is the arc length

The perimeter is 30.

Solve simultaneous equations
3. (Original post by Student21)
Arc AB of circle centre O has radius r and angle of 0.5 Radians. Given the perimeter of AOB is 30 find r.

how do I do this, the answer should be 12 but I keep getting 1.04 which is way off.

Bear in mind that it is talking about the perimeter of the whole sector (pizza slice), rather than just the arc length.

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: April 7, 2013
Today on TSR

Am I pregnant?

...or just paranoid?

A robot wrote Harry Potter?

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

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

Chat with other maths applicants

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.