Lagrange equation, of a hoop?

Shahbakht

Poster warned about not providing an attempt at a solution
Homework Statement
Two equal masses are glued to a massless hoop of radius R that is free to rotate about its center in a vertical plane. The angle between the masses is 2*theta. Find the frequency of small oscillations.

I dont get that if two masses, so where do we take the postion vector from? From the centre?
Homework Equations
d/dt(dL/dtetha)=dL/dtetga
I couldn't even get the position vector. Help!

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BvU

Homework Helper
Hello Shahbakht, !

Can you do it for $\theta = 0$ ? We need some effort from you before we are allowed to assist -- see guidelines

"Lagrange equation, of a hoop?"

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