The value of the third angle when discussing the angles on the straight line when other angles are given is 60°.
Your information is incomplete. Therefore, an overview will be given. It should be noted that the angle on a straight line is 180°.
In this case, let's assume that A is 45° and B is 75°, the value of the third angle will be calculated thus:
= 180° - (45° + 75°)
= 180° - 120°
= 60°
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