piemath
piemath
23-11-2016
Mathematics
contestada
How do you find x in this polygon?
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baabaagreysheep
baabaagreysheep
23-11-2016
(5 - 2) x 180 = 540 = sum of interior angles in pentagon
180 - 42 = 138°
180 - 80 = 100°
110 + 100 + 138 + 2x + x = 540
348 + 3x = 540
- 348
3x = 192
÷ 3
x = 64°
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