Question 898055
The description implies isosceles triangle (two sides are equal).

x for either equal side
b for base
What exactly is, "The base is twice the length of the sides."?


This interpretation will be b=2x; if wrong, then you make the other interpretation and solve accordingly.


To continue,
{{{x+x+b=64}}}
{{{2x+b=64}}}
{{{2x+2x=64}}}
{{{4x=64}}}
{{{x=64/4}}}
{{{x=16}}}, and {{{b=32}}}.