Respuesta :

Answer:

  B.  18 cm²

Step-by-step explanation:

The area of a trapezoid can be found using the formula ...

  A = 1/2(b1 +b2)h

For the given dimensions, the area is ...

  A = 1/2(7 cm +5 cm)(3 cm) = 1/2(12)(3) cm² = 18 cm²