triangle abc with segment bd where point d is between points c and a, bc equals x, bd equals y, cd equals w, da equals z, and ba equals v what expression represents the value of y? y equals the square root of quantity x times v end quantity y equals the square root of quantity w times z end quantity y equals the square root of quantity w times the sum of w plus z end quantity y equals the square root of quantity z times the sum of w plus z end quantity