tolong bantu jawabannya

Luas bangun                           = L.Segitiga atas+ L.Segitiga Bawah + L.PP
                                                = 1/2 x 12 . 9 + 1/2 x 12 x 9 +  16 x 15
                                                = 54 + 54 + 240
                                                = 348 m²
Luas Ubin = 40 x 40
                 = 1600 cm
                 = 0,16 m²

Banyak Ubin yang diperlukan = 348 : 0.16
                                                = 2175 ubin