72+57=129 180-129= 51 degrees for 1
90-72= 18 degrees for 2
180-57= 123 degrees for 3
123+18=141 180-141= 39 degrees for angle 4
Answer: angle 1 = 51, angle 2 = 18, angle 3 = 123, angle 4 = 39
Explanation:
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