Prove that the least perimeter of an isosceles triangle in which a circle of radius r can be inscribed is `6sqrt3r`.

Prove that the least perimeter of an isosceles triangle in which a circle of radius r can be inscribed is 6sqrt(3)r.

Prove that the least perimeter of an isosceles triangle in which a circle of radius r can be inscribed is 6sqrt(3)r

Prove that the least perimeter of an isosceles triangle in which a circle of radius 'r' can be inscribed is 6rsqrt3

Show that the rectangle of maximum perimeter which can be inscribed in a circle of radius a is a square of side sqrt(2)a