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Kelas : 7 SMP
kalau tak salah soal ini terdapat pada soal UN matematika SMP th 2014
Luas tak diarsir = L I + L II - 2 L diarsir
= (18 × 15 cm²) + (11 × 11 cm²) - (2 × 72 cm²)
= 270 cm² + 121 cm² - 144 cm²
= 247 cm²