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= 1/2 . 18
= 9 cm
FE = AD
= AC + CD
= 10 + 15
= 25 cm
L.bangun = L. layang" ABFE + L.trap CDEF
= 1/2 . FB .AC + 1/2 (CD + FE) . t.trap
= 1/2 . 18 . 10 + 1/2 (15 + 25) . 9
= 90 + 1/2 . 40 . 9
= 90 + 180
= 270 cm² ..... jawaban : A