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= 2 * ( 1/4 πr² - 1/2 * a * t)
= 2 * ((1/4 * 3,14 * 10²) - (1/2 * 10 * 10))
= 2 * ((1/4 * 3,14 * 100) - (5 * 10))
= 2 * ((1/4 * 314) - 50))
= 2 * (78,5 - 50)
= 2 * 28,5
= 57 cm²