Need fast help, Geometric:

[TheDestroyer]

Thanks for integral, he made the potential.pdf analyse for an analytical mechanic but i still have 2 questions,

1- Why does the lenght up between the tengency point and top of (h) equals:

\ell + r\theta ?????????

2- Why the kinetic energy here equals:

T = \frac{1}{2} m(\ell + r\theta)^2 \dot{\theta}^2 ???

I mean why we replaced R with \ell + r\theta in the polar coordinates?

Thanks,

TheDestroyer