No
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no... a straight line is a 180 degrees half circle.
An obtuse triangle has an obtuse angle.
An obtuse angle has no complementary angle.
anything greater than 90 is called an obtuse angle If you are referring to the unit of measurement of an angle, one example of would be the Grad. Instead of splitting a circle into four 90-degree sections, it splits a circle into four 100 grad sections. This means that a 360-degree circle is equivalent to a 400 grad circle.
115 degrees is an obtuse angle