The figure above shows a portion of a road map on which the measures of certain angles are indicated. If all lines shown

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2019-04-26_1847.png
The figure above shows a portion of a road map on which the measures of certain angles are indicated. If all lines shown are straight and intersect as shown, is road \(PQ\) parallel to road \(RS?\)

(1) \(b = 2a\)
(2) \(c = 3a\)

Answer: C

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