Area Yellow is;
Area quarter circle with radius 6 cm - Area sector with radius 6 cm and angle 20° - Area triangle with two equal length 6 cm and angle 40°, the angle they form - Area sector with radius 6 cm and angle 40° + Area triangle with two equal length 6 cm and angle 40°, the angle they form.
= ¼(36π) - (20*36π÷360) - ½(36sin40) - (40*36π÷360) + ½(36sin40)
= 9π - 2π - 4π
= 3π cm²
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