Respuesta :

Answer:

Step-by-step explanation:

Since the angles of a triangle have to add up to 180 we can solve for angle b by adding the other two angles and subtracting them from 180

Solution

30+80+b=180

b=70

triangle ACB must add up to 180 degrees so, you will add 30 + 80. (110) and subtract it from 180. therefore the measure of B = 70 degrees.
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