Respuesta :

Jsf09

Answer:

Step-by-step explanation:

B =20+20 = 40

Then because the side issue B and issue C are congruent their angles are congruent so angle C = 40

A triangle is 180 total so subtract B and C to find A

A = 180-40-40 = 100

I do not remember the names of all the theorems.

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