Question 864453
This could be anything.  What kind of triangle?  The description gives you enough to find x.


{{{(1/2)x(4+2x)=60}}}
{{{x(2+x)=60}}}
{{{x^2+2x-60=0}}}


{{{x=(-2+sqrt(4+4*60))/(2)}}}
{{{x=(-2+2*sqrt(61))/2}}}
{{{highlight(x=-1+sqrt(61))}}}, which is also the base.
Use this if you want, to compute the altitude.  That is all you can do.