R, 7979 63 bytes, Robin Ryder's answer
x=pi*pi;cat(apropos("^.$")[c(T,ceilingsum(x,T),ceiling(ceilingsum(x,pi)*pi))],F:x,sep='')
Being allowed to use ()
let me use apropos
to grab the length-one function names, and then just index them to get the appropriate -/+
.