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What is this answer because I can't figure this out and my math teacher doesn't explain it very well

What is this answer because I can't figure this out and my math teacher doesn't explain-example-1
User Laker
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2 Answers

3 votes
72 = x+15
-15 -15
57 = x
User Flyn San
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72+72+144 and 144 minus 360 equals 216 so half of 216 is 10. so the top and bottom are 108 degrees.
User Pauline
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