Multiple choice

$ABC$ is an isosceles triangle inscribed in a circle of radius r. If $AB=AC & \ h $ is the altitude from A to BC and P be the perimeter of ABC, then $\lim_{ h\rightarrow 0 }{ \dfrac { \Delta }{ { P }^{ 3 } } }$ equals (where $\Delta$ is the area of traingle)

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$ABC$ is an isosceles triangle inscribed in a circle of radius r. If $AB=AC &amp; \ h $ is the altitude from A to BC and P be the perimeter of ABC, then $\lim_{ h\rightarrow 0 }{ \dfrac { \Delta }{ { P }^{ 3 } } }$ equals (where $\Delta$ is the area of traingle)