Find x in the following figures.

(a)

(b)

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Solution

We know that the sum of all exterior angles of any polygon is 360º.

(a) 125° + 125° + x = 360°

250° + x = 360°

x = 110°

(b)

60° + 90° + 70° + x + 90° = 360°

310° + x = 360°

x = 50°

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