Sir Mike Ambrose is the author of the question.
The side of the square is;
6.065425 cm
Therefore;
Area red in cm² to 2 d. p is;
Area triangle with height (2.1tan29.11) cm and base 2.1 cm
= 0.5*2.1(2.1tan29.11)
= 1.22779137323
≈ 1.23 cm²
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