Which reason can be used to fill in the numbered blank space?

When proving that all three angles of Triangle ABC add up to 180 degrees. The flow chart is missing a reason underneath the first listed Substitution on the right. The numbered blank space answer would be another Substitution. If your question asks for the final step in the attached diagram then, the answer would be Angle Addiction Postulate.

Read more on - (that answer was wrong with definition of supplementary angles)

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step-by-step explanation:

step-by-step explanation:

consider an orange peel: if you want to try and lay it flat, you have to stretch it, we know exactly how things are being stretched or squashed at any given point. we have many different map projections because each has different patterns of some projections can even preserve certain features of the earth without