Three identical particles are fixed to the corners of an isosceles ...

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Three identical particles are fixed to the corners of an isosceles right-angled triangle
\( \mathrm{P} \) by means of massless connecting rods. Each of the two sides has a length \( d \), the W moment of inertia of this rigid object when the axis of rotation coincides with the hypotenuse of the triangle is:
(1) \( \frac{1}{2} m d^{2} \)
(2) \( \frac{1}{4} m d^{2} \)
(3) \( m d^{2} \)
(4) \( \frac{3}{4} m d^{2} \)
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