Respuesta :

do 12 times 4 (48) then take 18 -12 = 5 and 5 times 3 is 15 split that in half (7.5) then add 48 and 7.5 = 55.5

55.5
48 is one of the areas and 7.5 is the other one and to find the total area it will be 55.5