Question 310441
The sides of a {{{30-60-90}}} triangle are in ratio of {{{hsin(30)-hsin(60)-h=0.5h-(sqrt(3)/2)h-h}}}
The perimeter would then be the sum of the three sides.
{{{P=0.5h+(sqrt(3)/2)h+h}}}
{{{P=20(1.5+(sqrt(3)/2))}}}
 or approximately,
{{{P=47.32}}}cm