Find the value of X with steps.
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80 degrees
Step-by-step explanation:
Sum (S) of internal angles of a polygon with n sides:
S = (n-2) x 180 degrees
Therefore, sum of internal angles of a polygon with n sides:
S = 3 x 180 = 540 degrees
The complement of 55 degrees on a straigt line is 125 degrees (180-55)
Total of 4 angles = 90 + 120 + 125 + 125 = 460 degrees
Therefore the unknown angle x is:
540 - 460 = 80 degrees
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