the winged dragon's attack and defense points are the sum total of the monster's sacrificed to summon it
The Winged Dragon of Ra's attack power depends on what monsters you sacrifice, it's attack and defense becomes the added total of all the monster's attack and defensive points that you sacrificed.
The Winged Dragon of Ra is basically the strongest because while Obelisk and Slifer have a fixed amount of attack points, the Winged Dragon of Ra has infinite.
For the legal Winged Dragon of Ra, you must pay all but 100 Life Points.
you ad all the atk and def of the sacrifced monsters.
It's first special ability is that it can't be special summoned, though it's more a restriction. Second is that his normal summon can't be negated. Also, when he's normal summoned, spells, traps and monster effects can't be activated. And, you can lower your Life Points to 100, The Winged Dragon of Ra will get Attack and Defence points equal to the Life points paid. And last, you can pay 1000 Life Points to select and destroy one monster on the field.
the legal winged dragon of Ra you first have to sacrifice 3 monsters to summoned it but it doesn't get the combined attack of the 3 tribute monsters you must first pay all but 100 life points to have gain the total amount of life points paid. So he would have an attack of 3800.
Ra's ATK is 0. When he is special summoned, you can pay all your lifepoints except 100, to boost his ATK by that many points. Note the legal version of Ra does not gain attack from the tributed monsters, unlike in the anime.
the crimson dragon isn't a card there is no attack points or defense points
its attack is the combined total the three monsters you tribute to summon it combine there attack points and that's its attack points and its defense points are the three monsters you tribute defense points. You put your lifepoints at 100, and whatever you subtracted is his attack and defense.
the Winged Dragon of Ra is the strongest because you can reduce your LP down to 1 and the Winged Dragon of Ra gains attack points equal to what you gave up.
If you are talking about the Winged Dragon of Ra...the effect is sacrifice 3 monsters and the attack becomes equivalent to those three monsters' attack points added up.
It has 3000 attack points.