Respuesta :

rongren79

Answer:

angleB+angleC=180° (since AB and DC are parallel and intersected by the transversal BC)

therefore, subtracting, angle B is 126°

3 angles of triangles also makes a 180°.

So, 14°+x+126°=180°

x= 180°- 140°

x=40°

Step-by-step explanation:

m<DCB + m<CBA = 180° (co-interior angles)

or, 54° + m<CBA = 180°

so, m<CBA = 180° - 54° = 126°

Now,

m<CBA + m<FAB + X = 180° (sum of interior angles of triangle)

or, 126° + 14° + X = 180°

or, X = 180° - 140°

so, X = 40°

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