Can someone please help me with this function? I am trying to do a nested IF
function with three IF options (Circle, Triangle, Square).
I am trying to get Excel to automatically calculate an area (in sq ft) based
on its dimensions, broken up according to the shape of the room.

Rather than using multiple columns to do this, though, I want to consolidate
it into an easy-to-read form for the user, such that the "Shape" column is a
drop-down, validated to include Circle, Triangle, & Square. I want the "Area"
column to calculate the area of the space based on the shape selected. The
values for the formula dimensions will be captured in Length (FT & IN), Width
(FT & IN), and Radius (FT & IN).

This is the function that I've created, but it is giving me a general error.

=IF(A1="Circle€�,=(PI()*((G9+H9/12)/2)^2))),IF(A1="Triangle",=(((C9+D9/12)*(E9+F9/12))/2),IF(A1="Square",=((C9+D9/12)*(E9+F9/12))))

Any help regarding how to fix my formula would be greatly appreciated.

Thank you!
--
Diane