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1. 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.

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2. so perimeter would be 30= r+r + arc length arc length= r x feta
3. (Original post by SophieL1996)
so perimeter would be 30= r+r + arc length arc length= r x feta
I think you mean theta. . .
4. Ok fair enough any ideas for this question? ^^^
5. (Original post by SophieL1996)
Ok fair enough any ideas for this question? ^^^
Your idea is the correct method
6. Use the perimeter formula and re-arrange to make r the subject.
7. It's a matter of rearranging when dealing with these questions.

Use all the information give to you.
8. (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
9. 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

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