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zlopas [31]
3 years ago
9

Help please?????????????

Mathematics
2 answers:
TiliK225 [7]3 years ago
6 0

Answer:

∠B = 130°

Step-by-step explanation:

the sum of the interior angles of a triangle is 180°

the measure of third angle = the sum of the interior angles - the sum of two angles

180 - (30 + 20) = 130

N76 [4]3 years ago
5 0

Answer:

Step-by-step explanation:

The given triangle ABC is an obtuse triangle because one of its angles it greater than 90 degrees. The sum of the angles in a triangle is 180 degrees. This means that

Angle A + Angle B + Angle C = 180 degrees

Looking at the triangle,

Angle A = 30 degrees

Angle C = 20 degrees

Therefore,

30 + angle B + 20 = 180

Angle B + 50 = 180

Subtracting 50 from the left hand side and the right hand side of the equation, it becomes

Angle B + 50 - 50 = 180 - 50

Angle B = 130 degrees

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