180 degrees.
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A straight angle, which measures 180 degrees, is the largest angle that can be formed on a two-dimensional plane.
A 120 degree angle is an obtuse angle. This means that the angle is between 90 and 180 degrees.
An acute angle is an angle that measures between 0 and 90 degrees. It is considered to be less than a right angle (90 degrees).
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An angle is acut if the internal measurement (the smallest one) is less then, but not equal to, 90 degrees. If the angle is 90 degrees, it is a right angle. If it is greater then 90 degrees, it is obtuse.
A tetrahedral molecule will have a 109.5 degree bond angle.