tana = 5/11
a = atan(5/11)°
sin(atan(5/11)) = 5/b
b = 12.0830459736 cm.
c = b-2.5
c = 9.5830459736 cm.
sin(atan(5/11)) = d/9.5830459736
d = 3.9654926392 cm.
5/11 = 3.9654926392/e
e = 8.7240838063 cm.
Therefore, area inscribed triangle yellow is;
de
= 0.5*3.9654926392*8.7240838063
= 17.2976450587 cm²
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