In the triangular sheet given \( \mathrm{PQ}=\mathrm{QR}=l \). If \...

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In the triangular sheet given \( \mathrm{PQ}=\mathrm{QR}=l \). If \( \mathrm{M} \) is the mass of the sheet. What is the moment of inertial about PR
(1) \( \frac{M l^{2}}{24} \)
(2) \( \frac{M l^{2}}{12} \)
(3) \( \frac{M l^{2}}{-} \)
(4) \( \frac{M l^{2}}{18} \)
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