luas bangun di bawah ini adalah...cm^2

Luas persegi panjang = 12 x 18 = 216 cm²
Luas segitiga = a x t / 2
                       = (12 + 4 + 4 ) x 18 /2
                       = 20 x 18 / 2
                       = 180 cm²

Luas bangun diatas = 216 + 180
                                 = 396 cm²

Semoga membantu

Luas persegi panjang = p × l
= 12 cm × 18 cm
= 216 [tex] {cm}^{2} [/tex]
Luas segitiga = 1/2 × a × t
= 1/2 × (4 cm + 12 cm + 4 cm) × 18 cm
= 1/2 × 20 cm × 18 cm
= 10 cm × 18 cm
= 180 [tex] {cm}^{2} [/tex]
Luas gabungan = luas persegi panjang + luas segitiga
= 216 [tex] {cm}^{2} [/tex] + 180 [tex] {cm}^{2} [/tex]
= 396 [tex] {cm}^{2} [/tex]