If mass goes as R-cube, gravity goes as R-squared, so surface gravity would be proportional to R, for equal denisity. All other things are rarely, equal, however. The earth is the densiest planet in the solar system, having an iron core. The Moon’s diameter, for instance, is about 3.67 times smaller than earth’s, but it’s surface gravity is about 6.05 times smaller because it is that much less dense.
If this planet has an iron core the size of earth’s and a lot of rock plied on top, it could have surface gravity much lower than earth’s. Either way, just as elephants and spiders exist on earth, complex life could exist on this planet. Even snakes.
Kepler measures light dips from transiting planets, a technique that gives the size, but not the mass of the planet. Doppler studies of its host star should reveal its mass as well.
[ If this planet has an iron core the size of earth’s and a lot of rock plied on top, it could have surface gravity much lower than earth’s ]
That would be awesome, a whole lot more landmass and less gravity to boot!!!! Awesome Holiday planet!
Actually a larger planet may have a higher differentiation during formation, making more of the heavy stuff sink into the core so your scenario is plausible!
2/3 the gravity with 2x the surface area, Let’s call it Earth II and find a way to get there NOW! :)