4) At Lincoln HS 168 students are in the band or NHS (National Honor Society), 57 students are in both band and NHS. If 123 students are in band, how many students are in NHS?
Need help

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Use pythagorean’s theorem and find the missing side lengths of the two smaller triangles and add them together
13^2 - 12^2 = 5
15^2 - 12^2 = 9
5+9 = 14
14 is the length of each side of the square
14^2 + 14^2 = 19.8
19.8 is the diagonal length of the inside if the square