class Renshu5_4 {
 public static void main(String[] args) {
  System.out.println("求める三角形の面積は、" + calcTriangleArea(10.0, 5.0) + "平方cm");
  System.out.println("求める円の面積は、" + calcCircleArea(5.0) + "平方cm");
 }
 
 public static double calcTriangleArea(double bottom, double height) {   // cm
  double area = bottom * height / 2;
  return area;
 }
 
 public static double calcCircleArea(double radius) {   // cm
  double area = radius * radius * 3.14;
  return area;
 }
}

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