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r 1/2 lingkaran besar (r1) = 20 cm
r 1 lingkaran kecil (r2) = 10 cm
dit: L diarsir
jawab:
L diarsir = L 1/2 lingkaran besar - L 1 lingkaran kecil
L diarsir = (1/2 × π × r1²) - (π × r2²)
L diarsir = (1/2 × 3,14 × 20²) - (3,14 × 10²)
L diarsir = (1/2 × 3,14 × 400) - (3,14 × 100)
L diarsir = 628 cm² - 314 cm²
L diarsir = 314 cm² ⇒ jwban.