Question

найти R
$l= sqrt{ frac{Rh}{500} }$

Answer 1

$l= sqrt{ frac{Rh}{500} } l^{2} =( sqrt{ frac{Rh}{500} } ) ^{2} l^{2} = frac{Rh}{500}$
$R= frac{ 500*l^{2} }{h}$