The exterior angles have been marked on the shape below. a+b+c+d=320^circ Work out the size of the angle marked f.

# Explanation:## Step 1:Firstly, we need to understand the concept of exterior angles of a polygon. The sum of exterior angles of any polygon is always equal to .## Step 2:Given that the sum of the exterior angles is , we can calculate the angle by subtracting the sum of angles from the total sum of exterior angles of the polygon, which is .### The formula to calculate angle is: ### \(f = 360^{\circ} - (a + b + c + d)\)## Step 3:Substitute the given values into the formula.# Answer:By substituting the given values into the formula, we get . So, the size of the angle marked is .