Using Pythagoras Theorem: 5=22+12
Taking positive square root we get
1. Mark a point 'A' representing 2 units on number line.
2. Now construct AB of unit length perpendicular to OA. Join OB
3. Now taking O as centre and OB as radius draw an arc, intersecting number line at point C.
4. Point C represents on number line
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Not normally because an irrational number can't be expressed as a fraction which can be represented on the number line.
These number can also be represented on real line.
fractions are represented in form of decimals
By numbers at the same distance but on opposite sides of zero.
Answering that would be a snap if I could have a peek at the line, but until then, it's totally impossible.