Sir Mike Ambrose is the author of the question.
Calculating Red Area Exactly.
AC = 12 cm
AB = 10 cm
Therefore Area red exactly in cm² is;
Area triangle with two side (165/90) cm and √(61) cm, and angle atan(5/6)°
= ½*(165/90)*√(61)sin(atan(5/6))
= 4.58333333333 cm²
= 4125/900 cm²
= 55/12 cm²
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