Question 52121
A = 1/2*bh
(-1,2),(-1,-1),(-6,2)
{{{b = sqrt((x2 - x1)^2 + (y2 - y1)^2)}}}
{{{b = sqrt(((-1) - (-6))^2 + (2 - 2)^2)}}}
{{{b = sqrt(5^2 + 0^2)}}}
{{{b = 5}}}
{{{h = abs(-1 - 2) }}}
{{{h = 3}}}
{{{A = 1/2*(5*3)}}}
{{{A = 7.5}}}