Find the area of the polygon
a) 64.9ft^2
b) 129.8ft^2
c) 27.9ft^2
d) 33.8ft^2

Hey there,

Key point: 

We would do 22 × 5.9.

And that would give us 

But, if we were to do it like that, that would be considered as doing it as a square, so we divide.

 ÷ 2 . . .

And that would give us .

We have to  this because 
we have to remember that this is not a square, this
is a triangle.

Your correct/clarified answer would be: 

Hope this helps.
~Jurgen