Help! Please! The formula is A=1/2(b1+b2)h

Answer:
1/2(8*8)5
1/2* 320
ans= 160
is this answer is right??
Step-by-step explanation:
soln;
b1 = 5m
b2 = 8m
h = 8m
now,
a = 1/2(b1+b2)h
= 1/2(5+8)8
= 52 cm^2