Because a rectangular pyramid's base is square, the cross section would be as well
I believe that you are doing multiplication with this.
So… 9 x 3.65 = 32.85
Hope this helps. :)
Steps to solve:
15 + 2a = 35
~Subtract 15 to both sides
2a = 20
~Divide 2 to both sides
a = 10
Best of Luck!
You will divide eveything by 6
you will end up with
Angle 6, angle 4, angle 3, and angle 2 are all exterior angles.
Hope this helps!