Find the missing number in the following set of figures –

A pattern that fits the second figure exactly is:

Center=2×((Left×Top)−(Right×Bottom))

Checking the second figure:

2×((4×1)−(5×2))=2×(4−10)=2×(−6)=−12

Applying the same rule to the third figure:

2×((6×3)−(2×4))=2×(18−8)=2×10=20

Missing number = 20