Answer:
To find the sum of interior angles in a polygon, we can use the formula:
where n is the number of sides.
Since this is pentagon (5 sides), then 
The missing angle would then be

Since angles on a straight line add up to 180, then


Answer:divide 3.5 by 2 so its 1.75
Step-by-step explanation:
A. the first one is the answer
Step-by-step explanation: