Viewing insights from 2022 AMC 12B Problem 14 that are similar (thus shared) with only this insight from 2023 AMC 10B Problem 25: The pentagon has an angle of 180 x 3/5 which is 36x3 = 108 degrees If we split the area into 5 equal triangles each triangle has area 1+ root(5) / 5 by mathed2718
- tan(A+B) = (tan(A) + tan(B))/(1 - tan(A)*tan(B)) by Richie
- Note that ∠ABO < π/2 and∠CBO < π/2 by Richie
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