Sir Mike Ambrose is the author of the question.
Area Gold exactly in square cm decimal form is;
Area trapezium with two parallel side 6√(13) cm and 14.9769052981 cm, and height 11.6487041207 cm - Area triangle with height 9.6896279025 cm and base 6√(13)sin(atan(1.75)) cm
= (½*11.6487041207(6√(13)+14.9769052981)) - (½*9.6896279025*6√(13)sin(atan(1.75)))
= 213.23076923 - 91
= 122.23076923 cm²
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