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L = 18 x 20
L = 360
L persegi = s x s
L = 17 x 17
L = 289
L kedua bangun = 649
L bangun tidak diarsir = 529
jadi, dikurangin aja..
649-529 = 120
kalau salah maaf ya :)
= 360 cm²
L Persegi = s x s = 17 cm x 17 cm
= 289 cm²
L total = 360 cm² + 289 cm²
= 649 cm²
L daerah diarsir = 649 cm² - 529 cm²
= 120 cm²