How the area of largest triangle and rectangle gets equal?

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A rectangle of the largest possible area is cut out from a semi-circle of perimeter 72 cm. What is the area of the rectangle cut out? ( Take n = 22 / 7 )

- 196 cm
^{2} - 156.8 cm
^{2} - 210 cm
^{2} - 528 cm
^{2}

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