Problem 1:
n = 5 sides
130 + a + 83 + 90 + 90 = 180(n - 2)
a + 393 = 180(5 - 2)
a + 393 = 540
a = 540 - 393
a = 147°
Problem 2:
n = 4 sides
84 + 84 + b + b = 180(n - 2)
2b + 168 = = 180(4 - 2)
2b + 168 = 360
2b = 360 - 168
2b = 192°
Problem 3:
n = 6 sides
f + 117 + 130 + 121 + 115 + 112 = 180(n - 2)
f + 595 = 180(6 - 2)
f + 595 - 720
f = 720 - 595
f = 125°
Problem 4:
n = 4 sides
85 + 112 + x + 90 = 180(n - 2)
x + 287= 180(4 - 2)
x + 287 = 360
x = 360 - 287
x = 73°
Problem 5:
n = 6 sides
interior angle = 180(n - 2)
interior angle = 180(6 - 2)
interior angle = 180(4)
interior angle = 720°
y = 720/6
y = 120°
z = 180 - 120
z = 60°
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