Sir Mike Ambrose is the author of the question.
Area D exactly in cm² is;
Area trapezoid with parallel sides 4 cm and 8 cm, and height 4 cm - Area triangle with height 4 cm and base 3 cm - Area sector with radius 4 cm and angle atan(4/3).
= (½*4(4+8)) - (½*4*3) - (atan(4/3)*π*4²÷360)
= 24 - 6 - (2πatan(4/3))/45
= 18 - (2πatan(4/3))/45
= (810 - (2πatan(4/3)))/45 cm²
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