Hello from MrBillDoesMath!
Answer:
96 degrees
Discussion:
There are (5-2)*180 = 3 * 180 = 540 degrees in the pentagon. Hence by adding up the angles
90 + 90 + 145 + 131 + x = 540 => add up the angles
456 + x =540 =>
x = 84
As x + y = 180, y = 180 -x = 180 - 84 = 96 degrees
Thank you,
MrB
