From 1st picture, deduce the 2 chords are the same size, since the circumference of each circle passes the centre of the other identical circle.
Concentrating on the middle circle only:
From 2nd picture, we can flip the “split leaf” into the “edges” of the circle. Remaining is 6 pcs of small triangles or 2 equilateral triangles.
Area of 6 “split leaf” = Area of middle circle -48 -48 = π x 6 x 6 -48 -48
= 17.0 cm2 = 17 cm2 (nearest whole number*)
*for interest only: If I am a killer setter, I will ask like “using π as 3.14, give your answer to the nearest 1 decimal place” (answer will then be 17.0, not 17.1). This can be the 1/2 mark to differentiate the kids.