Answer:
pentagon and x = 85
Step-by-step explanation:
The polygon has 5 sides and is a Pentagon.
The sum of the interior angles of a polygon is
sum = 180° (n - 2) ← n is the number of sides
Here n = 5, thus
sum = 180° × 3 = 540°
Sum the 5 interior angles and equate to 540, that is
x + x + 35 + x + 25 + 120 + 105 = 540, simplifying
3x + 285 = 540 ( subtract 285 from both sides )
3x = 255 ( divide both sides by 3 )
x = 85
