Geometry. Area Of Triangle | California State University, Northridge - Edubirdie

University:
California State University, Northridge
Course:
COMP 110 | Introduction to Algorithms and Programming and Lab
Academic year:

2023
Views:

448

Pages:

2
Author:

S Kim

(GEOMETRY: AREA OF A TRIANGLE) Write a program called “TriangleArea” that prompts the user to enter three points, (x1, y1), (x2, y2), and (x3, y3), of a triangle then displays its area. The formula for computing the area of a triangle is: 𝑠= 𝑎𝑟𝑒𝑎 = (𝑠𝑖𝑑𝑒1 + 𝑠𝑖𝑑𝑒2 + 𝑠𝑖𝑑𝑒3) 2 𝑠(𝑠 − 𝑠𝑖𝑑𝑒1)(𝑠 − 𝑠𝑖𝑑𝑒2)(𝑠 − 𝑠𝑖𝑑𝑒3) Here is a sample run: If input is: 1.5 -3.4 4.6 5 9.5 -3.4 The expected output is: The area of the triangle is 33.60  Use printf() method for output  Upload “Triangle.java “to Zybooks for grading. import java.util.Scanner; public class TriangleArea { public static void main(String[] args) { Scanner input = new Scanner(System.in); // Enter the coordinates of three points System.out.print("Enter the coordinates of the first point (x1 y1): "); double x1 = input.nextDouble(); double y1 = input.nextDouble(); System.out.print("Enter the coordinates of the second point (x2 y2): "); double x2 = input.nextDouble(); double y2 = input.nextDouble(); System.out.print("Enter the coordinates of the third point (x3 y3): "); double x3 = input.nextDouble(); double y3 = input.nextDouble(); // Calculate the side lengths double side1 = Math.sqrt(Math.pow(x2 - x1, 2) + Math.pow(y2 - y1, 2)); double side2 = Math.sqrt(Math.pow(x3 - x2, 2) + Math.pow(y3 - y2, 2)); double side3 = Math.sqrt(Math.pow(x1 - x3, 2) + Math.pow(y1 - y3, 2)); // Calculate the semi-perimeter double s = (side1 + side2 + side3) / 2; // Calculate the area double area = Math.sqrt(s * (s - side1) * (s - side2) * (s - side3)); // Print the output using printf method System.out.printf("The area of the triangle is %.2f%n", area); // Close the Scanner input.close(); } }

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