diff --git a/em-oop/src/day3_123/Circle.java b/em-oop/src/day3_123/Circle.java
new file mode 100644
index 0000000..928e1fd
--- /dev/null
+++ b/em-oop/src/day3_123/Circle.java
@@ -0,0 +1,22 @@
+package day3_123;
+
+public class Circle extends Shape {
+	private double radius;
+	
+	public Circle(double radius) {
+		super("円");
+		this.radius=radius;
+	}
+	
+	@Override
+	public double area() {
+		return Math.PI*radius*radius;
+	}
+	
+	@Override
+	public void showInfo() {
+		super.showInfo();
+		System.out.println("(半径:"+this.radius+")");
+	}
+
+}
diff --git a/em-oop/src/day3_123/Day3Check1.java b/em-oop/src/day3_123/Day3Check1.java
new file mode 100644
index 0000000..89902d4
--- /dev/null
+++ b/em-oop/src/day3_123/Day3Check1.java
@@ -0,0 +1,10 @@
+package day3_123;
+
+public class Day3Check1 {
+
+	public static void main(String[] args) {
+		Circle circle=new Circle(2);
+		circle.showInfo();
+	}
+
+}
diff --git a/em-oop/src/day3_123/Shape.java b/em-oop/src/day3_123/Shape.java
new file mode 100644
index 0000000..c298bb8
--- /dev/null
+++ b/em-oop/src/day3_123/Shape.java
@@ -0,0 +1,15 @@
+package day3_123;
+
+public abstract class Shape {
+	private String name;
+	public Shape(String name) {
+		this.name=name;
+	}
+	
+	public abstract double area();
+	
+	public void showInfo() {
+		System.out.println(this.name+"の面積は"+this.area()+"です");
+	}
+
+}