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Answer:
8. 118°
9. 89°
Step-by-step explanation:
The exterior angle is equal to the sum of the remote interior angles.
8. x = 48° +70° = 118°
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9. ∠BCD = 38° +51° = 89°
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Additional comment
Both the sum of the remote interior angles and the exterior angle are supplementary to the interior angle adjacent to the exterior angle. Two angles supplementary to the same angle have the same measure.
