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If 2=27,what is the measure of the supplement of gbc

If 2=27,what is the measure of the supplement of gbc-example-1
User BeepDog
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<GBC and <2 are vertical angles, so they are congruent.
m<GBC = m<2 = 27
Supplementary angles have measures that add to 180 deg.
The supplement of <GBC measures 180 - 27 = 153 deg.
User The Sasquatch
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