Question clockw

4.1 Lines, Angles, and Triangles - Angle relationships (parallel lines)
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  • Clockwise from top left, the 3 lines are labeled t, m, and n.
  • Line t intersects both line m and line n.
  • At the intersection of line t and line m, 1 angle is labeled clockwise from top left as follows:
    • Bottom left: 134/li>
  • At the intersection of line t and line n, 1 angle is labeled clockwise from top left as follows:
    • Bottom left: w/li>
  • A note indies the figure is not drawn to scale. 

In the figure, line m is parallel to line n . What is the value of w ?

A.

13

B.

34

C.

66

D.

134

Clockwise from top left, the 3 lines are labeled t, m, and n. Line t intersects

Easy-difficulty · SAT Math · Lines, Angles, and Triangles — Angle relationships (parallel lines). Read the question above, select your answer, and check the full explanation below to understand exactly why the correct choice works.

Answer explanation

Choice D is correct. It's given that lines m and n are parallel. Since line t intersects both lines m and n , it's a transversal. The angles in the figure marked as 134° and w° are on the same side of the transversal, where one is an interior angle with line m as a side, and the other is an exterior angle with line n as a side. Thus, the marked angles are corresponding angles. When two parallel lines are intersected by a transversal, corresponding angles are congruent and, therefore, have equal measure. It follows that w°=134°. Therefore, the value of w is 134 .

Choice A is incorrect and may result from conceptual or calculation errors.

Choice B is incorrect and may result from conceptual or calculation errors.

Choice C is incorrect and may result from conceptual or calculation errors.