Respuesta :

13. 80 + 60 - 140. 180 - 140 = 40 degrees.
14. 90 + 160 + 85 = 275. 360 - 275 = 85 degrees.
16. 105 + 60 + 120 + 115 = 400. 450 - 400 = 50 degrees.
17. 180 - 110 -70 / 2 = 35. 180 - 35 = 145 degrees.

Hope this helps.
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