tolong bsk kumpulin please

No.3
luas 1 = 1/2 × a × t
= 1/2 × 8 × 12
= 4 × 12 = 48 cm2
luas 2 = p × l
= 16 × 7 = 112 cm2
luas = 112 + 48 = 160 cm2