diff --git a/CMakeLists.txt b/CMakeLists.txt
index 61fd995c9..e63fef1e4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,6 @@
 cmake_minimum_required(VERSION 3.6)
 project(LC)
+SET(CMAKE_C_FLAGS    "${CMAKE_C_FLAGS} -pthread")
 
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 option(WITH_QT_UI "With QT user interface" ON)
diff --git a/lcUILua/createActions/circleoperations.lua b/lcUILua/createActions/circleoperations.lua
index c9970139f..4ea63664c 100644
--- a/lcUILua/createActions/circleoperations.lua
+++ b/lcUILua/createActions/circleoperations.lua
@@ -1,5 +1,8 @@
 CircleOperations = {}
 CircleOperations.__index = CircleOperations
+local Circle_FirstPoint
+local Circle_SecondPoint
+local Circle_ThirdPoint
 
 setmetatable(CircleOperations, {
     __index = CreateOperations,
@@ -12,19 +15,36 @@ setmetatable(CircleOperations, {
 
 function CircleOperations:_init(id)
     CreateOperations._init(self, id, lc.builder.CircleBuilder, "enterCenter")
-
+    cli_get_text(self.target_widget, true)
     self.builder:setRadius(10)
-    message("CIRCLE", self.target_widget)
+    Circle_FirstPoint = nil
+    Circle_SecondPoint = nil
+    Circle_ThirdPoint = nil
+    message("<b>CIRCLE1</b>", self.target_widget)
+    message("Options: <u>2</u>P, <u>3</u>P, <u>T</u>TT, TT<u>R</u>", self.target_widget)
     message("Provide Center Point:", self.target_widget)
 end
 
 function CircleOperations:enterCenter(eventName, data)
     if(eventName == "point") then
         self.builder:setCenter(data["position"])
-        message("Options: <Radius> , Diameter", self.target_widget)
+        message("Options: <u>R</u>adius , <u>D</u>iameter", self.target_widget)
         message("Provide Radius:", self.target_widget)
-        cli_get_text(self.target_widget, true)
         self.step = "enterRadius"
+    elseif(eventName == "text") then
+        if ((data["text"]) == "2" or string.lower(data["text"]) == "2p") then
+            message("Provide Diameter Start Point:",self.target_widget)
+            self.step = "CircleWith2Points"
+        elseif ((data["text"]) == "3" or string.lower(data["text"]) == "3p") then
+            message("Provide Frist Point:",self.target_widget)
+            self.step = "CircleWith3Points"
+        elseif (string.lower(data["text"]) == "t" or string.lower(data["text"]) == "ttt") then
+            message("Provide Frist Tangent:",self.target_widget)
+            self.step = "CircleWith3Tans"
+        elseif (string.lower(data["text"]) == "r" or string.lower(data["text"]) == "ttr") then
+            message("Provide Frist Tangent:",self.target_widget)
+            self.step = "CircleWith2Tans"
+        end
     end
 end
 
@@ -68,4 +88,51 @@ function CircleOperations:enterDiameter(eventName, data)
     if(eventName == "point") then
         self:createEntity()
     end
+end
+
+function CircleOperations:CircleWith2Points(eventName, data)
+    if (eventName == "point" and not Circle_FirstPoint) then
+        Circle_FirstPoint = data['position']
+    elseif (eventName == "mouseMove" and Circle_FirstPoint) then
+        self.builder:setCenter(Circle_FirstPoint:mid(data["position"]))
+        self.builder:setRadius(Circle_FirstPoint:distanceTo(data["position"]) / 2)
+    elseif (eventName == "point" and Circle_FirstPoint) then
+        self.builder:setCenter(Circle_FirstPoint:mid(data["position"]))
+        self.builder:setRadius(Circle_FirstPoint:distanceTo(data["position"]) / 2)
+        self:createEntity()
+        Circle_FirstPoint = nil
+    end
+end
+
+function CircleOperations:CircleWith3Points(eventName, data)
+    if (eventName == "point" and not Circle_FirstPoint) then
+        Circle_FirstPoint = data['position']
+        message("Provide Second Point:",self.target_widget)
+    elseif(eventName == "point" and Circle_FirstPoint and not Circle_SecondPoint) then
+        message("Provide Third Point:",self.target_widget)
+        Circle_SecondPoint = data['position']
+    elseif(eventName == "point" and Circle_FirstPoint and Circle_SecondPoint and  not Circle_ThirdPoint) then
+        Circle_ThirdPoint = data['position']
+        self.builder:setCenter(self:Circumcenter(Circle_FirstPoint,Circle_SecondPoint,Circle_ThirdPoint))
+        self.builder:setRadius(self.builder:center():distanceTo(Circle_ThirdPoint))
+        self:createEntity()
+    end
+end
+
+function CircleOperations:CircleWith3Tans(eventName, data)
+    message("TODO:3 Tan Circle.",self.target_widget)
+end
+
+function CircleOperations:CircleWith2Tans(eventName, data)
+    message("TODO:2 Tan Circle.",self.target_widget)
+end
+
+function CircleOperations:Circumcenter(Point1,Point2,Point3)
+    local Angle1=Point1:angleBetween(Point2,Point3)
+    local Angle2=Point2:angleBetween(Point3,Point1)
+    local Angle3=Point3:angleBetween(Point1,Point2)
+    local X = (Point1:x() * math.sin(2 * Angle1) + Point2:x() * math.sin(2 * Angle2) + Point3:x() * math.sin(2 * Angle3) ) / ( math.sin(2 * Angle1) + math.sin(2 * Angle2) + math.sin(2 * Angle3))
+    local Y = (Point1:y() * math.sin(2 * Angle1) + Point2:y() * math.sin(2 * Angle2) + Point3:y() * math.sin(2 * Angle3) ) / ( math.sin(2 * Angle1) + math.sin(2 * Angle2) + math.sin(2 * Angle3))
+    local Output=lc.geo.Coordinate(X,Y)
+    return Output
 end
\ No newline at end of file