Step 3Upstairs Window, Lower Sash
Using the finished corner of posterboard as point C, transfer the measurements of C to G and C to E onto the posterboard and cut from E to G.
You should have one triangle, C-E-G.
Ignore the other letters. I don't know why I got so carried away.
If you do this step 3 more times, you will have four triangles that will fit the two windows as shown. With any luck, you may get two triangles out of one piece of posterboard.
Tape them in place as shown.
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