Answer:
168
Step-by-step explanation:
(11 +17) ×12 /2
28×12 /2
=168
all about formule
C. 168ft²
area: S = a + b /2 × h
S = 11 + 17 / 2 × 12
S = 28/2 × 12
S = 14 × 12
S = 168
