KLMN is a rectangle and KQN, LPM are straight lines. Find the area, in $cm ^{2}$, of the shaded portion. (A) 65 (B) 72 (C) $80 \frac{1}{4}$ (D) $80 \frac{1}{2}$

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KLMN is a rectangle and KQN, LPM are straight lines. Find the area, in $cm ^{2}$, of the shaded portion. (A) 65 (B) 72 (C) $80 \frac{1}{4}$ (D) $80 \frac{1}{2}$