Question 502224
Start with:
{{{A = (1/2)b*h}}} for the area of a triangle. A is given as 338.
{{{h = 4b}}} now you can write the equation.
{{{(1/2)b*h = 338}}} Substitute {{{h = 4b}}}
{{{(1/2)(b(4b)) = 338}}} Simplify the left side.
{{{2b^2 = 338}}} Divide both sides by 2.
{{{b^2 = 169}}} Take the square root of both sides.
{{{b = 13}}} and...
{{{h = 4b}}}
{{{h = 4(13)}}} 
{{{h = 52}}}
The base is 13 and the height is 52.