Question 176650
{{{r=sqrt(k(k-a)(k-b)(k-c))/k}}}
:
where {{{k =(1/2)(a+b+c)}}} and a,b,and c are the lengths of the sides
:
{{{k=(1/2)(12+12+8)=16}}}
:
{{{r=sqrt((16)(16-12)(16-12)(16-8))/16}}}
:
{{{r=4sqrt((4)(4)(8))/16}}}
:
{{{r=4sqrt((64)(2))/16}}}
:
{{{r=32sqrt(2)/16}}}
:
{{{r=2sqrt(2)}}}