Hello, loizoud94!
Two parallel chords are 2cm from the centre of a circle of radius 4cm.
Calculate the area between them. Code:
* * *
*::::::::::*
*::::::::::::::*
A*    +    *B
* *
* * 120°* *
* *O *
*  *

C*    +    *D
*::::::::::::::*
*::::::::::*
* * *
The area of the circle is: . cm².
The area between the chords is:
. . the area of the circle minus the area of the two shaded segments.
We find that the sector has a central angle of 120°.
Hence, the area of the sector is: .
The area of is: .
. . Hence, the area of a segment is: .
The area betwen the chords is: .
Therefore: . cm²