  Hougthon's groups H_n is a family of groups where each H_n consists of
`translations at infinity' on n rays of discrete points emanating from the
origin on the plane. Brown shows H_n has type FP_n-1 but not FP_n by
constructing infinite dimensional cell complex on which H_n acts with certain
conditions. We modify his idea to construct n-dimensional CAT(0) cubical
complex X_n on which H_n acts with the same conditions as before. Brown also
shows H_n is finitely presented provided n>2. Johnson provides a finite
presentation for H_3. We extend his result to provide finite presentations of
H_n for n>3. We also establish exponential isoperimetric inequalities of H_n
for n>2.
