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Angle B: 135 degrees

Angle A: 60 degrees

Angle C:  75 degrees

Step-by-step explanation:

Angle B is 135 degrees

We have the complement of angle B, which is the lowest left corner of the triangle and it says 45 degrees.

So, B = 180 - 45 = 135 degrees

Angle A.

The lines crossing form 2 pair of identical angles from their tip... The exterior angle is 60 degrees, so the interior angle A is also 60 degrees.

Angle C.

Just like for angle B, we get angle C by subtracting its complement:

C = 180 - 105 = 75 degrees.

We can also validate by calculating the sum of the interior angles of the triangle: 45 + 60 + 75 = 180, which is perfect.

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