Sir Mike Ambrose is the author of the question.
Area yellow is;
½(0.63245553204*0.75)sin(atan⅓)
= 0.075 square units.
Area ABC is;
½(3*3.75)sin(2tan⅓)
= 3.375 square units.
Area yellow ÷ Area ABC is;
0.075 ÷ 3.375
= 75/3375
= 1/45
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