Distance in 3 Dimensional space?

local function findDistance(position1, position2) --Takes two Vector3 arguments
    local X1 = position1.X; local X2 = position2.X;
    local Y1 = position1.Y; local Y2 = position2.Y;
    local Z1 = position1.Z; local Z2 = position2.Z;

    return math.sqrt((X2-X1)^2+(Y2-Y1)^2+(Z2-Z1)^2)
end

Or you could have a function that works with both Vector2 and Vector3

local function findDistance(position1, position2)
    local distance = 0;
    if position1:IsA("Vector3") and position2:IsA("Vector3") then
        local X1 = position1.X; local X2 = position2.X;
        local Y1 = position1.Y; local Y2 = position2.Y;
        local Z1 = position1.Z; local Z2 = position2.Z;
        distance = math.sqrt((X2-X1)^2+(Y2-Y1)^2+(Z2-Z1)^2);
    elseif position1:IsA("Vector2") and position2:IsA("Vector2") then
        local X1 = position1.X; local X2 = position2.X;
        local Y1 = position1.Y; local Y2 = position2.Y;
        distance = math.sqrt((X2-X1)^2+(Y2-Y1)^2)
    end
    return distance;
end