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Verified answer
Kelas 8 MatematikaBab Bangun Datar
Luas segitiga = 1/2 . a . t
Luas yang diarsir
= luas segitiga kiri + luas segitiga kanan - 2 . luas segitiga bawah
= (1/2 . 14 . (6 + 7 + 8)) + (1/2 . 14 . (7 + 8)) - 2 . 1/2 . 14 . 8
= (7 . 21) + (7 . 15) - 112
= 147 + 105 - 112
= 140 cm²