give the definition of an andle
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two angles that have the same angle measure
A straight angle is by definition 180°.
No. By definition, the compliment to an angle is an angle whose measure would combine with the first to reach 90 degrees. Also, by definition, an obtuse angle is an angle whose measure is greater than 90 degrees. There is no angle that can be added to an angle larger than 90 degrees that will cause that angle to be 90 degrees (because the measure of an angle is inherently positive.) Therefore, there is no compliment to an obtuse angle.
A protractor is an instrument that is used when you need to measure an angle.
They form an angle with a measurement of exactly 90° - that is part of the definition of :"perpendicular".