Based on the Congruent Supplements Theorem, <1 = <3 are congruent, given that <1 and <2 and <2 and <3 are supplements.
The Congruent Supplements Theorem shows that when two angles are considered to be supplements of a certain angle, then those two angles must be congruent.
Filling in the chart would therefore be:
<1 and <2 are
supplementary <1 = <3
GIVEN Congruent Supplements Theorem
<2 and <3 are
supplementary
GIVEN
Find out more on the Congruent Supplements Theorem at https://brainly.com/question/17385360.
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