Lines x and y are parallel. Which statement is not true? A) m∠1 = (6x + 8)° because they are corresponding angles. B) m∠1 = 74° because ∠1 is supplementary to the angle marked 106°. C) m∠1 + (6x + 8)° + (7x – 2)° = 180° because they form a straight line, which measures 180°. D) (7x – 2)° + m∠2 = 106° because the sum of the remote interior angles is equal to the exterior angle.

Mathematics · Middle School · Thu Feb 04 2021

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To identify which statement is not true, we need to consider the properties of parallel lines and the angles formed when they are intersected by a transversal.

A) If lines x and y are parallel and m∠1 is a corresponding angle to an angle on line y, then m∠1 should equal (6x + 8)° by the Corresponding Angles Postulate. This statement could be true given that the lines are parallel.

B) If m∠1 is supplementary to an angle marked 106°, then they should add up to 180° because supplementary angles have a sum of 180°. Therefore, m∠1 = 180° - 106° = 74°. This statement is true.

C) If m∠1, (6x + 8)°, and (7x – 2)° form a straight line, their measures should indeed add up to 180° due to the Straight Angle Theorem. This statement could be true as long as these angles are consecutive along a straight line.

D) This statement indicates that (7x – 2)° and m∠2 are remote interior angles to an exterior angle of 106°. However, the sum of the remote interior angles equals the exterior angle only in the context of a triangle. Since we have not been given any information that suggests that these angles are part of a triangle, statement D is likely the one that is not true, as it inaccurately applies a property of triangles to a situation that does not seem to involve a triangle.

Therefore, the statement that is not true based on the information provided is:

D) (7x – 2)° + m∠2 = 106° because the sum of the remote interior angles is equal to the exterior angle.