Sid @ askiitian
Last Activity: 15 Years ago
Hi Anushka

Here in h = r sin θ ,
The area of a rectangle ie. length * breadth or
{BD X (AO +CO)} ie {2r X (h+h)}
by dividing rectangle in two half triangles and calculating each. (half X base X Height) X 2
will be maximum when h will be max. and h is maximum only when θ = 90.
which makes rectangle a square