Ineed to find the area of the polygon

The answer is 207 or a.

Draw a line and make it 2  rectangles or squares depending where you draw it. lets say you draw a horizontal like on the 12ft line, so it makes 2 shapes. then find the area accordingly.  

the line would make a square: 9ft by 9ft find the area using length times width. 
A=81

The line makes a second shape, a rectangle: 21ft by 6ft find the area Length times Width.
A=.126

Add the amounts together to get the total Area which is: 207.

Option A. 

You're doing something i dont know how to do but search up on google slope calculator maybe that will get you there