Respuesta :

A = (a+b)h/2

a = 12

b = 18

h = 7.5

A = (12+18)(7.5/2)

A = 30(3.75)

A=112. 5cm

Answer:

112.5 cm

Step-by-step explanation:

18+12 /2 x 7.5

15x7.5

112.5