find the unknown angles marked in each of the following figures.
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find the unknown angles marked in each of the following figures.
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x. +x +40 =180
2x+40=180
2x=180-40
2x=140
x=70
the sum of the angle of a triangle =180°
x + x + 40= 180.
2x=180-40
2x=140
x=140/2
x=70