Problem: 6|-3|-4|5| Whenever something is in: |21| in the lines, you would just count the number itself. So it is: 6·3-4·5 which would equal: 6·3-4·5 The answer to 6·3 is 18, so its 18 minus the answer of 5·4 which is 20. So its: 18-20= -2 ~Hope i helped. :)
In a regular polygon, each exterior angle equals each central angle. central angle = 360 / #sides #sides = 360 / central angle #sides = 360 / 60 #sides = 6