Answer
60
Explanation:
So a given shape will always have a degree of 180.
We know one of the degrees is 60, so we can subtract that to find the missing degree angles: 180 - 60 = 120
We can divide 120 by 2 to spilt that into two degrees: 120 ➗ 2 = 60
(If you have math sense, you can tell that they all have the same angle, so same angle means same degree)
Well hope ya have a great day!