updated

Author: HarryDulaney

.classpath

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+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
+	<classpathentry kind="output" path="bin"/>
+</classpath>

.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>java-programming-daniel-liang-10th</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>

Ch_04/Exercise04_03.java

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+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
+	<classpathentry kind="output" path="bin"/>
+</classpath>

src/.classpath

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>java-programming-daniel-liang-10th</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>

.gitignore src/.gitignore

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+package Ch_04;
+
+/* 4.3 (Geography: estimate areas) Find the GPS locations for Atlanta, Georgia;
+Orlando, Florida; Savannah, Georgia; and Charlotte, North Carolina from
+www.gps-data-team.com/map/ and compute the estimated area enclosed by these
+four cities. (Hint: Use the formula in Programming Exercise 4.2 to compute the
+distance between two cities. Divide the polygon into two triangles and use the
+formula in Programming Exercise 2.19 to compute the area of a triangle.)
+-84.2782200,33.8901000 Atlanta
+-81.5197542,28.4283959 Orlando
+-81.1746100,32.1081500 Savannah
+-80.9567600,35.2072400 Charlotte
+Formula for distance -->>> d = radius * arccos(sin(x1) * sin(x2) + cos(x1) * cos(x2) * cos(y1 - y2)) 
+
+ *
+ *  s = (side1 + side2 + side3)/2;
+ *  area = SQRT((s - side1)(s - side2)(s - side3))
+ *
+ *
+ */
+
+/**
+ * @author Harry G. Dulaney IV
+ */
+
+public class Exercise04_03 {
+
+	static double addTwoTriangles(Triangle t1, Triangle t2) {
+		return t1.area + t2.area;
+	}
+
+	public static void main(String[] args) {
+
+		double radius = 6_371.01; // Mean radius of Planet Earth
+
+		// Find distance between points for Triangle One
+		double atlantaToCharlotte, charlotteToSavannah, savannahToAtlanta;
+
+		atlantaToCharlotte = radius * Math.acos(Math.sin(-84.27822) * Math.sin(-81.5197542)
+				+ Math.cos(-84.2782200) * Math.cos(-81.5197542) * Math.cos(33.8901000 - 32.10815));
+
+		charlotteToSavannah = radius * Math.acos(Math.sin(-80.95676) * Math.sin(-81.17461)
+				+ Math.cos(-80.95676) * Math.cos(-81.1746100) * Math.cos(35.20724 - 32.1081500));
+
+		savannahToAtlanta = radius * Math.acos(Math.sin(-81.17461) * Math.sin(-84.27822)
+				+ Math.cos(-81.1746100) * Math.cos(-84.27822) * Math.cos(32.10815 - 33.8901));
+
+		Triangle triangle1 = new Triangle(atlantaToCharlotte, charlotteToSavannah, savannahToAtlanta);
+		triangle1.computeArea();
+
+		// Find the distance need for Triangle two
+		double savannahToOrlando, orlandoToAtlanta;
+
+		savannahToOrlando = radius * Math.acos(Math.sin(-81.17461) * Math.sin(-81.5197542)
+				+ Math.cos(81.17461) * Math.cos(-81.5197542) * Math.cos(32.10815 - 28.4283959));
+
+		orlandoToAtlanta = radius * Math.acos(Math.sin(-84.27822) * Math.sin(-81.519754)
+				+ Math.cos(81.17461) * Math.cos(-81.5197542) * Math.cos(33.8901000 - 28.4283959));
+
+		Triangle triangle2 = new Triangle(savannahToOrlando, orlandoToAtlanta, savannahToAtlanta);
+		triangle2.computeArea();
+		
+		double areaOfPolygon = addTwoTriangles(triangle1,triangle2);
+		
+		System.out.println("Using the Great Circle calculation, the estimated area enclosed by "
+				+ "\nAtlanta, Charlotte, Savannah, and Orlando is " + areaOfPolygon);
+
+	}
+
+}
+
+class Triangle {
+
+	double side1;
+	double side2;
+	double side3;
+	double area;
+
+	public Triangle(double side1, double side2, double side3) {
+		this.side1 = side1;
+		this.side2 = side2;
+		this.side3 = side3;
+	}
+
+	void computeArea() {
+		double s = side1 + side2 + side3;
+		area = Math.sqrt(s * (s - side1) * (s - side2) * (s - side3));
+	}
+
+	/**
+	 * @return the area
+	 */
+	public double getArea() {
+		return area;
+	}
+
+	/**
+	 * @param area the area to set
+	 */
+	public void setArea(double area) {
+		this.area = area;
+	}
+}