Question 468954
Let the base equal x.
Then the height equals 2x.
Area of triangle = {{{(1/2)b*h}}}
Therefore
{{{100 = (1/2)x*2x}}}
Multiply right side, 2/2=1, x*x=x^2
{{{100 = x^2}}}
Take square root of both sides
{{{10 = x}}}
The length of the base is 10