Whats the distance between the 2 points? (use Pythagorean Theorem)

Your horizontal value (x) is 3 because 5.5-2.5 = 3
Your vertical value (y) is 3.5 because 4.5-1 = 3.5
Pythagoras Theorem
[tex]c^{2}= \sqrt{a^{2}+b^{2} }[/tex]
a = 3
b = 3.5
[tex]c^{2}= \sqrt{3^{2}+3.5^{2} }[/tex]
c = 4.61 to 2d.p.