Sir Mike Ambrose is the author of the question.
Area yellow in square units to 2 decimal places is;
Area triangle with height (tan70+tan(450/7)) units and base (tan70+tan54)sin80 units.
= ½(tan70+tan(450/7))(tan70+tan54)sin80
= 9.79563286034 square units.
≈ 9.80 square units.
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