how to do this , like i have added their formual in order to find the radius but i cant solve it cause i need to get the fitta, ? anyone can show me ?

The total perimeter of the minor sector + the total primeter of major sector
= circumference + 4r
Can you see why?
 
You don't need to know the angle. Did you see my post #3?

(You have marked the angle alpha \(\displaystyle \alpha\). I think your "Fitta" is meant to be "theta" \(\displaystyle \theta\).)
 
You don't need to know the angle. Did you see my post #3?

(You have marked the angle alpha \(\displaystyle \alpha\). I think your "Fitta" is meant to be "theta" \(\displaystyle \theta\).)
Oh sorry , I meant that. But how will I use the formula if I don't know the theta, like it's embedded in the formula , and if I use the formula, I will be left with the theta and I won't be able to get my radius
 
As I said in Post #3:
The total perimeter of the minor sector + the total perimeter of major sector = circumference + 4r

Can you see why?

(You don't have to work out the total perimeter of each sector separately, so you don't need he angle)
 
I
As I said in Post #3:
The total perimeter of the minor sector + the total perimeter of major sector = circumference + 4r

Can you see why?

(You don't have to work out the total perimeter of each sector separately, so you don't need he angle)
OK, I am going to have a look and try to get it ,
 
Another question: Do you know what a "sector" is? Do you know what the perimeter of a sector is?
 
The perimeteris of the two sectorhas alreadybeen given , I just need to find the radius
 
I know that. Please answer my questions. I am trying to help you understand.

Do you know what a sector is?
Have you drawn the two sectors separately?
Do you know what the perimeter of a sector is? (Not the value, the concept)
 
The perimeteris of the two sectorhas alreadybeen given ,
I know that. Please answer my questions. I am trying to help you understand.

Do you know what a sector is?
Have you drawn the two sectors separately?
Do you know what the perimeter of a sector is? (Not the value, the concept)
A sector is the region bounded by an archive and two radii of the circle

The perimeter of a sector is the length of arc + the 2 radius
And I have drawn the two sector separately
 
I
The perimeteris of the two sectorhas alreadybeen given ,

A sector is the region bounded by an archive and two radii of the circle

The perimeter of a sector is the length of arc + the 2 radius
And I have drawn the two sector separately
Ok good. Now look at your two sectors. The total combined perimeters is made up of 4 radii and a full circle. Can you see that?
 
OK so the combined perimeters are equal to \(\displaystyle 4r+2\pi r = (4 +2\pi)r\).

You also know that the combined perimeter is 123.40cm.

So now what?
 
OK so the combined perimeters are equal to \(\displaystyle 4r+2\pi r = (4 +2\pi)r\).

You also know that the combined perimeter is 123.40cm.

So now what?
Equal the given perimeter to the formula to get the radius, isn't it?
 
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