Going around a full circle is 360.
1/4 of that is 90
So 90 degrees is 1/4 of a circle
Its an absurd decimal, which I'm pretty sure you don't want but will give to you anyway. Its roughly 0.02631578947...
Answer: 
Step-by-step explanation:
Rewrite the expression:

Factor out the negative:


Rewrite the sum:


Calculate the sum:


Solve:


Please mark brainliest if this helped you :)
I hope this helps you
-4,-3,-2,-1,0,1,2,3,4,5,6