Respuesta :

Answer:

168

Step-by-step explanation:

(11 +17) ×12 /2

28×12 /2

=168

all about formule

Answer:

C.  168ft²

Step-by-step explanation:

area: S = a + b /2 × h

S = 11 + 17 / 2 × 12

S = 28/2 × 12

S = 14 × 12

S = 168