Select two points so that the distance between them is equal to 2 sqrt(5).
(0,3), (-20,15), (12,7), (3,4), (1,-8), (0,3), (4,4), (-5,8), (-10,-12)
Going to use Pythagoras' Theorem
c2 = a2 + b2
(2 sqrt(5))2 = a2 + b2
(4 • 5) = a2 + b2
20 = a2 + b2
I can't make any of the provided pairs work.
However, take note that (0,3) is listed twice.
Why? Let's assume there’s a typo. What if
the second one were (10,3) instead. When
we choose (10,3) & (12,7) we find precisely
what we want, the hypotenuse as follows:
c2 = (7 – 3)2 + (12 – 10)2
c2 = 42 + 22 = 16 + 4
c2 = 20
c = sqrt(20) = 2 sqrt(5)
.