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Kelas 8 MatematikaBab Kesebangunan
Panjang sisi daerah yang diarsir
= sisi ABCD : 2
= 8 : 2
= 4 cm
Luas yang tidak diarsir
= luas ABCD + luas PQRO - 2 . daerah diarsir
= (s1 . s1) + (p . l) - 2 . s2 . s2
= (8 . 8) + (12 . 10) - 2 . 4 . 4
= 64 + 120 - 32
= 152 cm²