Question 945450
{{{EF=GD=9}}}
So then,
{{{FG+ED+18=30}}}
{{{FG+ED=12}}}
Since {{{FG=ED}}},then
{{{FG=ED=6}}}
.
.
.
{{{EC=ED+CD}}}
{{{EC=6+9}}}
{{{EC=15}}}{{{cm}}}