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when 2 straight lines intersect a 15degrese angle is formed.what is the measure of the obtuse angle also formed?

User Bbudge
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The obtuse angle is 165 degrees.

You find this by subtracting 15 from 180
180 - 15 = 165
This works because the two angles (15 and 165) are supplementary. They add to 180 degrees and form a straight angle.
User Greenif
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