Why is the "vector3" im imputing counting as a Number?

I am making a system where the script detects where two objects are and fires a laser from one to the other so to get the length of the laser I do some maths. However, when I enter the variable it does not count it as a vector3.

Code:

local laserpos = game.ServerStorage.MeatLoaf:Clone()
laserpos.Parent = game.Workspace.Camera
local tool = script.Parent
local mouse = game.Players.LocalPlayer:GetMouse()
local laser = game.ServerStorage.Laser:Clone()
laser.Parent = game.Workspace.Camera
mouse.TargetFilter = game.Workspace.Camera

local clicked = false

tool.Equipped:connect(function(mouse)

    mouse.Button1Down:connect(function()
        clicked = true
    end)

    mouse.Button1Up:connect(function()
        clicked = false
        tool.Fire1.BrickColor=BrickColor.Black()
        game.Workspace.Camera.MeatLoaf.Position = game.Workspace.ss.Position
        game.Workspace.Camera.Laser.Position = game.Workspace.ss.Position
    end)

end)

while wait(0.05) do
    if clicked then
    local mouse = game.Players.LocalPlayer:GetMouse()
      tool.Fire1.BrickColor=BrickColor.Red()
local LLX = ((tool.Fire1.Position.X-game.Workspace.Camera.MeatLoaf.Position.X)/2) + game.Workspace.Camera.MeatLoaf.Position.X
local LLZ = ((tool.Fire1.Position.Z-game.Workspace.Camera.MeatLoaf.Position.Z)/2) + game.Workspace.Camera.MeatLoaf.Position.Z
local LLY = ((tool.Fire1.Position.Y-game.Workspace.Camera.MeatLoaf.Position.Y)/2) + game.Workspace.Camera.MeatLoaf.Position.Y
local LL = math.sqrt(LLX^2+LLZ^2+LLY^2)

        game.Workspace.Camera.Laser.Size=LL,0.5,0.5
        game.Workspace.Camera.Laser.Position=((tool.Fire1.Position-game.Workspace.Camera.MeatLoaf.Position)/2) + game.Workspace.Camera.MeatLoaf.Position
        game.Workspace.Camera.MeatLoaf.Position=mouse.Hit.p

        wait(0.05)


    end
end

error: Players.Player1.Backpack.Multi Tool.LocalScript:35: bad argument #3 to 'Size' (Vector3 expected, got number)