First you have to get them to have the same denominator so what goes into both 4 and 5, it’s 20. 3/4 x 5/5= 15/20 4/5 x 4/4= 16/20 15/20 - 16/20 = -1/20
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Answer is 360. Let me know if you need a. explanation. it's kind of weird. you have to sort of combine all the angles and see that they form a complete circle.