diff --git a/app.js b/app.js
new file mode 100644
index 0000000..507c694
--- /dev/null
+++ b/app.js
@@ -0,0 +1,21 @@
+const calc = require('./calc');
+// const calc = require('./calc-this');
+
+
+const {log} = console;
+
+// // console.log(circleArea('4'))
+// // console.log(rectancleArea(4,'5'));
+// // rectancleArea('ㄱ','5','5');
+// // console.log(rectancleArea('5'));
+// // console.log(cylinderArea('4',6))
+
+// log(calc.getCircleArea(4,6));
+
+log(calc.getArea('circle',10));
+log(calc.getArea('circle',1,3));
+log(calc.getArea('rect',10,14));
+log(calc.getArea('trapezoid',10,14,5));
+
+calc.printExecutionSequence();
+// log(calc.printExecutionSequence())
\ No newline at end of file
diff --git a/calc-this.js b/calc-this.js
new file mode 100644
index 0000000..a48d8f6
--- /dev/null
+++ b/calc-this.js
@@ -0,0 +1,56 @@
+const check = require('./check');
+
+function circleArea(param) {
+    const [r] = check.checkParam(1, param);
+    return Math.PI * r * r 
+}
+
+function rectangleArea(param) {
+    const [w, h] = check.checkParam(2,param); 
+    return w * h;
+}
+
+function trapezoidArea(param) {
+    const [t, b, h] = check.checkParam(3,param);
+    return (t+b)/2 * h;
+}
+
+function cylinderArea(param) {
+    const [r, h] = check.checkParam(2, param);
+    return this.circle([r]) * h
+}
+
+function getRecursiveCircle(start, end){
+    if(start === end ) {return Math.PI * end * end;}
+    return (Math.PI * start * start) + getRecursiveCircle(start+1, end);
+}
+
+function getArea(figure, ...param){
+    let answer;
+    if(figure !== "circle" ) {
+        answer = this[figure](param);
+    }
+    else if(figure === "circle") {
+        answer = param.length === 1 ? this[figure](param) : this["getRecursiveCircle"](...check.checkParam(2,param))
+    }
+    this.sequence.push([figure, answer]) 
+    return answer
+}
+
+function printExecutionSequence(){
+    for (let el of this.sequence) {
+        console.log(`호출 함수: ${el[0]} 결과: ${el[1]}`)
+    }
+}
+
+module.exports = {
+        circle:circleArea,
+        rect:rectangleArea,
+        trapezoid:trapezoidArea,
+        cylinder:cylinderArea,
+        getRecursiveCircle,
+        getArea,
+        printExecutionSequence,
+        sequence : []
+    }
+
diff --git a/calc.js b/calc.js
new file mode 100644
index 0000000..b0eef32
--- /dev/null
+++ b/calc.js
@@ -0,0 +1,59 @@
+const check = require('./check');
+
+const circleArea = function(...param){
+    const [r] = check.checkParam(1,param);
+    return  Math.PI * r ** 2;
+}
+
+const rectancleArea = function(...param){
+    const [width , height] = check.checkParam(2,param);
+    return width * height;
+}
+const trapezoidArea = function(...param){
+    const [base, top, height] = check.checkParam(3,param);
+    return (base+top) * height / 2;
+}
+const cylinderArea = function(...param){
+    const [r, height] = check.checkParam(2,param);
+    return circleArea(r) * height;
+}
+
+
+const getRecursiveCircle = function(start,end){
+    const current = circleArea(start)
+    if(start === end) return current;
+    else return current + getRecursiveCircle(start+1,end)
+}
+
+const getArea = function(name,...param){
+    let answer; 
+    if(name === 'circle' && param.length === 2) {
+        answer = getRecursiveCircle(...param);
+    }
+    else {answer =  polygonAreaFunction[name](...param);}
+    
+    polygonAreaFunction.sequence.push({name,answer}); 
+
+    return answer;
+
+}
+
+const printExecutionSequence = function(){
+    polygonAreaFunction.sequence.forEach(el=>{
+        console.log(`호출함수는[${el.name}] 결과는[${el.answer}]`)
+    })
+}
+
+const polygonAreaFunction = {
+    circle:circleArea,
+    rect:rectancleArea,
+    trapezoid:trapezoidArea,
+    cylinder:cylinderArea,
+    sequence:[]
+}
+
+module.exports = {
+    getArea,
+    printExecutionSequence,
+
+}
diff --git a/check.js b/check.js
new file mode 100644
index 0000000..4eea6b9
--- /dev/null
+++ b/check.js
@@ -0,0 +1,22 @@
+const numCheck = function (param){
+    param.forEach(el => {
+        if(typeof el !== 'number'){
+            throw Error("숫자가 아닌값이 들어왔습니다.");
+        }
+    })
+    return true
+    
+}
+
+const checkParamCount = function (count , param){
+    if(count !== param.length) throw Error(` 들어온 인자는 ${param.length}개 이고 들어와야하는 인자는${count}개 입니다.`);
+    return true 
+}
+
+const checkParam = function(count,param){
+    return numCheck(param) && checkParamCount(count,param) && param
+}
+
+module.exports ={
+    checkParam
+}
\ No newline at end of file