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Lsegitiga = 2 {(a×t) ÷ 2}
Ltrapesium = 2 {(a+b).t ÷ 2}
Lsegitiga = 2 {(8×4,5) ÷ 2} = 18
L trapesium = {(10+5)×6.5 ÷ 2} = 48.75
Ditambah keduanya, lalu dikali 20
Jadi, (18 + 48.75) × 20 = 1335 buah genteng yang diperlukan....
Maaf kalau kurang jelas...
Smoga benar... (y)