Mathematics
Grade9
Easy
Question
The measure of the unknown angle x is ________.

- 91°
- 163°
- 107°
- Cannot determine
Hint:
The correct answer is: 107°
Here, 72° and
form a linear pair so 72° +
= 
So
= 180° - 72° = 108°
The sum of all interior angles of a pentagon is 540°
So, 90° + x° + 127° + 108° + 108° = 540°
x = 107°.
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