73² = (44-y)² + (x+21)²
5329 = 1936 + y² - 88y + x² + 441 + 42x
x² + y² + 42x - 88y = 2952
52² = x² + (28+y)²
2704 = x² + 784 + 56y + y²
x² + y² + 56y = 1920
by solving two equations
x = 40.48
y = 4.64
Area = (40.48 + 21) × 39.36/2 + 40.48 × 32.64/2 + 21 × 4.64 = 1968 cm²
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