tolong bantu jawab ya plisss

[tex]1. \: l \: = 12 \times 19 = 228 \times 2 = 456 {cm}^{2} \\ \: \: \: \: \: \: \: \: = (40 - 12 - 12) = 16 \times 10 = 160 \: {cm}^{2} \\ \: \: \: \: \: \: \: \: = 456 + 160 = 616 {cm}^{2} [/tex]