i would like to know this question and can you show your work to so I can understand

Answer:
162
Step-by-step explanation:
a=[tex]\frac{a+b}{2} h[/tex]
a=base and the base is 13 ft.
b= also means base which is 23 ft.
h= height which is 9 ft.
so 13+23 is 36
36/2 is 18
and 18 times 9 is 162
sorry for the lengthy answer but i hope this helps :) have a nice day !!