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an acute angle is an angle that is smaller than a straight angle (a straight angle is an angle that is perfect,in other words you can perfectly fit a corner of a papaer into it) :)
No, it is called a straight angle.
No, an obtuse angle and an acute angle cannot combine to form a straight angle. An obtuse angle measures more than 90 degrees, while an acute angle measures less than 90 degrees. The sum of these two angles would exceed 180 degrees, which is the measure of a straight angle. Therefore, they cannot combine to create a straight angle.
If you mean a 180o angle, which is represented as a straight line, then no. Two acute angles cannot add up to 180o because an acute angle is less than 90o.
Obtuse, acute, straight, and right angle.