\( P Q \) is the direct common tangent of two circles \( (S, 9 \mathrm{~cm}) \) and \( (R, 4 \ma... VIDEO
\( P Q \) is the direct common tangent of two circles \( (S, 9 \mathrm{~cm}) \) and \( (R, 4 \mathrm{~cm}) \) which touch each other externally. Find the area of the quadrilateral \( P Q R S \). (in \( \mathrm{cm}^{2} \) )
(a) 72
(b) 65
(c) 78
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