Nick says we cannot see any true lines in the real world. he thinks everything we call a line is really a line segment. do you agree or disagree? explain

Agree.
By mathematical terms, a line stretches on in either direction for an infinite amount of points, something that is not measurable in the real world.  Everything we loosely call 'lines' that we may spot, are in fact line segments.  Take for instance the blue lines on a sheet of notebook paper.  We may refer to them as lines but since they do have endpoints, they are line segments.

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Okay so for every triangle has three angles that always add up to 180 degrees. and to tell the difference between whether they are secure, right or obtuse is that acute: has one angle that is less than 90 degrees. right triangle means there is at least one angle that is exactly 90 degrees. and an obtuse angle has an angle that is bigger than 180 degrees. i’ll do #13 as an example: 13. 40 and 50 so if every triangle has 180 degrees 40+50= 90 degrees then180-90= 90 degrees so the third angle is 90 degrees and because this triangle has a 90 degree angle it means it is a right triangle