Question 540366
Use Pythagorean Theorem
{{{(2x)^2 + x^2 = 10^2}}}
{{{4x^2 + x^2 = 100}}}
{{{5x^2 = 100}}}
{{{x^2 = 20}}}
{{{x = 2sqrt(5)}}}
Therefore {{{2x = 4sqrt(5)}}}
{{{Area = base*height/2}}}
{{{Area = (2sqrt(5))(4sqrt(5))/2}}}
{{{Area = highlight(20)}}}