Respuesta :

25 because a triangle is 180 so those two angles equal 155 180-155 is 25
hailydenney2

Answer:

25°

Step-by-step explanation:

A triangle will always add up to 180 degrees when all angles are added.

So:

100 + 55 = 155

180 - 155 = ∠B

180 - 155 = 25

∠B = 25°

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