Brain teasers and puzzles: Twist your mind-puzzle missing number 120

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It's no so easy to solve this math puzzle.

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Below you can see the pattern

If A>B>C

(A-B)^2 + C^2=The number in the center of the shape

first shape

(8-5)^2+2^2=3^2+2^2=9=4=13

Second shape

(9-5)^2+2^2=4^2+2^2=16+4=20

Third shape

(6-3)^2+2^2=3^2+2^2=9=4=13

Correct answer is 13

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