Setting up a double integral over two regions

[Mdhiggenz]

Homework Statement

Homework Equations

The Attempt at a Solution

The question is in the picture, the new integral I got was

R1:0≤y≤x

R2:0≤x≤1

However the answer is
R1: is inner integral R2: is outer integral

I drew a graph showing my thought process.

R1:0≤y≤x

R2:0≤x≤√∏

 

[haruspex]

The double integral says y goes up to root pi. What does the inner integral look like when y is 1.5, say?

 

[Mdhiggenz]

Wouldn't X be 1.5 as well, since x=y?