I was doing some optimization questions to get ready for a test. I came across one that stumped me. The question was "Find the dimensions of the isosceles triangle of the largest area that can be inscribed in a circle of radius r". My approach was: let y be the base of triangle let x be the two equal sides of triange. A(t) = (bh)/2 = (y*(x^2-(y/2)^2)^1/2))/2 I cant find the equation to relate the radius to the area. help?