*****
A = 2√2 • R²
A = 2√2 • 15²
A = 2√2 • 225
A = 450√2
A = 636,4 cm²
============
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*****
A = 2√2 • R²
A = 2√2 • 15²
A = 2√2 • 225
A = 450√2
A = 636,4 cm²
============