Mathematics Question and Solution
Area Blue (Star) is;
Area circle of radius 20 cm - 5(area triangle with two length 14.5308505601 cm and angle 108°, the angle they form) - 5(Area sector of radius 20 cm and angle 72°) + 5(area triangle with two lengths 20 cm and angle 72°, the angle they form).
= 400π - 5(0.5sin(108)*14.5308505601²) - 5(72*400π÷360) + 5(0.5*400sin72)
= 400π - 502.028539715 - 1256.63706143 + 951.056516295
= 449.027976576 cm²
