Join TSR now and get all your revision questions answeredSign up now
    • Thread Starter
    Offline

    2
    ReputationRep:
    I don't know where to start with this. Any hints as to what formulas I should be thinking about?

    The arc AB of a circle, centre O and radius rcm, is such that angle AOB = 0.5 radians. Given that the perimeter of the minor sector AOB is 30cm:

    a) Calculate the value of r.


    Posted from TSR Mobile
    Offline

    0
    ReputationRep:
    so perimeter would be 30= r+r + arc length arc length= r x feta
    Offline

    3
    ReputationRep:
    (Original post by SophieL1996)
    so perimeter would be 30= r+r + arc length arc length= r x feta
    I think you mean theta. . .
    Offline

    0
    ReputationRep:
    Ok fair enough any ideas for this question? ^^^
    Offline

    3
    ReputationRep:
    (Original post by SophieL1996)
    Ok fair enough any ideas for this question? ^^^
    Your idea is the correct method
    Offline

    0
    ReputationRep:
    Use the perimeter formula and re-arrange to make r the subject.
    • TSR Support Team
    • Community Assistant
    • PS Reviewer
    Offline

    18
    ReputationRep:
    It's a matter of rearranging when dealing with these questions.

    Use all the information give to you.
    • Study Helper
    Offline

    15
    ReputationRep:
    (Original post by JodieW)
    I don't know where to start with this. Any hints as to what formulas I should be thinking about?

    The arc AB of a circle, centre O and radius rcm, is such that angle AOB = 0.5 radians. Given that the perimeter of the minor sector AOB is 30cm:

    a) Calculate the value of r.

    Posted from TSR Mobile
    (Original post by SophieL1996)
    so perimeter would be 30= r+r + arc length arc length= r x feta
    Use SophieL's method, add up all the bits and solve the equation you get for r
    • Thread Starter
    Offline

    2
    ReputationRep:
    I still don't know how to figure it out. It seems like I have too little information. Please any more tips?

    EDIT: figured it out, it was staring at me in the face and I missed it. Thanks guys!


    Posted from TSR Mobile
 
 
 
Poll
If you won £30,000, which of these would you spend it on?
Useful resources

Make your revision easier

Maths

Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

Equations

How to use LaTex

Writing equations the easy way

Student revising

Study habits of A* students

Top tips from students who have already aced their exams

Study Planner

Create your own Study Planner

Never miss a deadline again

Polling station sign

Thinking about a maths degree?

Chat with other maths applicants

Can you help? Study help unanswered threads

Groups associated with this forum:

View associated groups

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

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