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Goowik · Answer 1 · 2018-07-02T04:04:59+0000

if you add the angles of a triangle, your sum should always be 180°

70° + 80° + x° = 180°
150° + x = 180°

subtract 150 from both sides of the equation.....
150° + x = 180°
-150 -150

x = 30

your answer is 30°

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