The order of a differential equation is the order of the highest derivative involved in the equation. So the
order comes out to be 2/3 as we have \(\sqrt{1-\left(\cfrac{dy}{dx}\right)^2}=\left(a\cfrac{d^2y}{dx^2}\right)^{1/3}\)
and the degree is the highest power to which a derivative is raised. So the power at this order is 2.
So the answer is 2/3, 2.