I’m working on a project that needs a part to be positioned in a random place (inside the red part)
but I have no idea how to do this, but I need a lot …

here is the red part (Part where the blue block should be positioned randomly within the red area)

Since you need a random position inside a circle you could use polar coordinates.

local center = -- circle center
local maxRadius = -- circle radius
local randomAngle = math.random() * math.pi * 2
local randomRadius = math.random() * maxRadius
-- rotate by Angle then move out by Radius
local position = (CFrame.new(center) * CFrame.Angles(0, randomAngle, 0) * CFrame.new(randomRadius, 0, 0)).Position
block.Position = position

local center = -- circle center
local maxRadius = -- circle radius
local randomAngle = math.random() * math.pi * 2
local randomRadius = math.sqrt(math.random()) * maxRadius
-- rotate by Angle then move out by Radius
local position = (CFrame.new(center) * CFrame.Angles(0, randomAngle, 0) * CFrame.new(randomRadius, 0, 0)).Position
block.Position = position

I’ve added a math.sqrt() to fix that issue and it now gives a distribution like the one on the right (within that link).

yes,this is my script that i am using to test if it will work correctly in my game

local Circleposition = script.Parent.Position
local maxRadius = 10
local randomAngle = math.random() * math.pi * 2
local randomRadius = math.random() * maxRadius
script.Parent.Transparency = 1
for i = 1,5 do
local Clone = script.Parent:Clone()
Clone.BrickColor = BrickColor.Random()
Clone.Transparency = 0
local position = (CFrame.new(Circleposition) * CFrame.Angles(0, randomAngle, 0) * CFrame.new(randomRadius, 0, 0)).Position
Clone.Position = position
Clone.Parent = workspace
end

and for some reason it is cloning well more than just 5 times

This clones the parent of the script. The new clone also contains a clone of the same script. Hence, the script is creating more and more copies of itself. You want to avoid cloning the script over when you clone your script.Parent. You could add a Clone:ClearAllChildren() underneath that line to make sure the clone doesn’t contain a copy of the same script.