A roll to determine whether an attack hits. To make an attack roll, roll 1d20 and add the appropriate modifiers for the attack type, as follows: melee attack roll = 1d20 + base attack bonus + Strength modifier + size modifier; ranged attack roll = 1d20 + base attack bonus + Dexterity modifier + size modifier + range penalty. In either case, the attack hits if the result is at least as high as the target's Armor Class.