C2 Radians help!

I have no clue what to do with this question. Any hints?

A sector of a circle of radius r cm contains an angle of 1.2 radians. Given that the sector has the same perimeter as a square of area 36cm^2, find the value of r.

I know that the perimeter is therefore 24cm. What should I be doing now? :/


Posted from TSR Mobile

I have no clue what to do with this question. Any hints?

A sector of a circle of radius r cm contains an angle of 1.2 radians. Given that the sector has the same perimeter as a square of area 36cm^2, find the value of r.

I know that the perimeter is therefore 24cm. What should I be doing now? :/


Posted from TSR Mobile

I have no clue what to do with this question. Any hints?

A sector of a circle of radius r cm contains an angle of 1.2 radians. Given that the sector has the same perimeter as a square of area 36cm^2, find the value of r.

I know that the perimeter is therefore 24cm. What should I be doing now? :/


Posted from TSR Mobile

I got r=7.5 not sure if its right?

2r+1.2r=24
3.2r=24
r=7.5

7.5x1.2=9 for the length of arc

7.5+7.5+9=24 the perimeter.

I got r=7.5 not sure if its right?

2r+1.2r=24
3.2r=24
r=7.5

7.5x1.2=9 for the length of arc

7.5+7.5+9=24 the perimeter.

It's against the rules to post full solutions.

In future, if you want clarification of a question that isn't yours, please wait until the OP has done the question themselves.

What's the arc length of the sector in terms of r?

Then the perimeter of the sector is the length of the two radii (2r) plus the length of the arc and this sum is equal to 24.

Hi, I was attempting the question myself, how do you get 24 as the perimeter? I thought it was 36? :O

Hi, I was attempting the question myself, how do you get 24 as the perimeter? I thought it was 36? :O

The area of the square is 36 which means that the side length is 6.