In a one-dimensional number line, moving 15 units to the right from 0 means adding 15 to 0. Therefore, 15 units right of 0 is at the point +15 on the number line. This can also be expressed as the coordinate (15,0) in a Cartesian coordinate system.
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Perimeter: 15+20+25 = 60 units
17 units in length
It's exactly 15 units away from zero. If you consider 15 to be close, then it's close.
It is 39 units in length
Using Pythagoras' theorem it is 17 units in length