Aaron Tovish
Jul 13, 2024

Both the triangles have the side-ratios, 3,4,5. the bigger one has a multiple factor of 5, the smaller one, 4. Thus (1/2)* 3*4*(5*5+4*4)=246 for the white area, ergo 154. (Same as Mr. Kibasa, although he did not explain where the 13 and 16 sides came from.)

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