GUI Arc

local FillCount = 100 -- how many frames
local Size = 50 -- pixels^2
local SG = Instance.new("ScreenGui", Game.StarterGui);
local ArcTop = 300 -- Height of arc in pixels
local ArcLength = 1050 -- Length of arc in pixels

for i = 0, FillCount do
    local F = Instance.new("Frame");
    F.Size = UDim2.new(0,Size,0,Size);
    local PercentY = (i/FillCount)
    local PosX = (i/FillCount) * ArcLength
    local Y = math.sin(PercentY * math.pi);
    F.Position = UDim2.new(0,PosX,.5,-(Y*ArcTop) );
    F.Rotation = ((180/FillCount)*i) + 90;
    F.Parent = SG
end