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paper masha
Not sure about straight angels, but a straight angle is simply a straight line which goes through the vertex.
That means to look at each statement separately and evaluate after each step.
A cutting can mean many things. As it stands, this question can't really be answered without you defining the word a little more. Look on the left and hit the IMPROVE QUESTION button and rephrase this question so that we know what "a cutting" means, then erase this answer (that's the IMPROVE ANSWER button) and we'll start all over again!
An example of a 90 degree angle is any of the four corners of an A4 page.