Melanie cuts a rectangle out of a piece of scrap paper as shown. She wants to calculate the angle measure of the piece that is left over

Answer:
The angle measure of the piece that's left over would be 36°.
Step-by-step explanation:
A rectangle has four right angles. A right angle has a measure of 90°.
Taking 90° out of the 126° angle leaves us with
126-90 = 36°.