Question 1023060
To find the number of sides of the polygon using the given sum of interior angles

we need to use the formula
(n-2)180 and the given number 3780

so (n-2)180 = 3780
    180n - 360 = 3780
    180n - 360 + 360 = 3780 + 360
    180n       0     = 4140
    
    180n/180             = 4140/180
     
      n                  = 23