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Rus_ich [418]
3 years ago
13

What is the measure of angle B?​

Mathematics
2 answers:
QveST [7]3 years ago
6 0

Answer:

b = 60

Step-by-step explanation:

The sum of the angles of a triangle are 180

80+40+b = 180

Combine like terms

120+b =180

Subtract 120 from each side

b = 180-120

b = 60

vampirchik [111]3 years ago
6 0

Answer:

60°

Step-by-step explanation:

Recall that all triangles have an interior angle sum of 180. In other words:

\angle A+\angle B +\angle C = 180

Plug in the angle values we know:

(80)+(40)+\angle B  = 180\\120+\angle B =180\\\angle B = 60\textdegree

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Refer to the image below:

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