Can you outgolf me? (Robbers section)
Jelly, 5 4 bytes, George V. Williams
RÆḊḞ

Try it here.
A hidden feature!
If I remembered correctly, ÆḊ(A) = sqrt(det(AAT)) is n! times the n dimensional Lebesgue measure of a simplex formed by n input point and the origin in m dimensional space. When n=1 it degenerate to the Euclidean distance. Not that weird after all...