Question 767048
MO and OR and the diagonal MR are three lengths of a triangle; and we do not know the angle at point R, but we can find it using Law Of Cosines.  


{{{5^2+3^2-2*5*3*cos(r)=6^2}}}
{{{25+9-30*cos(r)=36}}}
{{{-30*cos(r)=0}}}
{{{cos(r)=0}}}
{{{r=pi/2}}} a right angle.


This is simply a RECTANGLE, 5 cm by 3 cm.