Sir Mike Ambrose is the author of the question.
Area Blue Exactly in decimal cm² is;
Area triangle with height 3.84187454245 cm and base 5sin(180-atan(12/5)-atan(4/5))
= ½*3.84187454245*5sin(180-atan(12/5)-atan(4/5))
= 0.5*3.84187454245*5sin(73.960056694)
= 9.23076923075 cm²
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