Perhatikan gambar! Luas daerah arsiran adalah....

luas yg diarsir = L trapesium -L segitiga 1 - L segitiga 2
= (1/2 x Jlm sisi sejajar x t) - (1/2 x a x t) - (1/2 x A x T)
= (1/2 x (4+14) x 6) - (1/2 x 4 x 2) - (1/2 × 6×4)
= 54-4-12
= 38 cm^2