Question 713975
Area for triangle:  {{{(1/2)bh}}}, where b is base, h is height.


{{{84=(1/2)bh}}}
and
{{{b=4h}}}


Substitute b into the area equation.
{{{84=(1/2)(4h)h}}}
{{{84=(1/2)4h^2}}}
{{{84=2h^2}}}
{{{42=h^2}}}
ANSWER: {{{highlight(h=sqrt(42))}}}, {{{highlight(b=4sqrt(42))}}}
h=sqrt(2*3*7), not simplifiable further.