Which one will replace the question mark?

and (4 x 9) = 36 and (2 x 9) = 18

Therefore (9 x 6) = 54 and (4 x 6) = 24.

and (3)² + (9)² = 90

Therefore (1)² + (5)² = 26.

and (3)² + (4)² + (6)² + (2)² = 65 x 10 = 650

Similarly (0)² + (1)² + (2)² + (8)² = 69 x 10 = 690.

(5 + 4) x 12 = 108.

(789 - 543) = 246

(863 - 241) = 622.

(16 + 24 + 40)/10 = 8

Similarly, (45 + 18 + 27)/10 = 9.

and 6 x 9 x 7 = 378

Therefore 5 x 7 x ? = 315

? = 9.

In first circle,

(3)² = 9

(4)² = 16

(5)² = 25

(6)² = 36.

In second circle,

(4)² = 16

(5)² = 25

(6)² = 36

(7)² = 49.

In third circle,

(6)² = 36

(7)² = 49

(8)² = 64

(9)² = 81.

Therefore, (2)² = 4.