/* */ package ch04; /* */ /* */ import java.util.Scanner; /* */ /* */ public class ComputeAngles { /* */ public static void main(String[] args) { /* 7 */ Scanner input = new Scanner(System.in); /* */ /* */ /* 10 */ System.out.print("Enter three points: "); /* 11 */ double x1 = input.nextDouble(); /* 12 */ double y1 = input.nextDouble(); /* 13 */ double x2 = input.nextDouble(); /* 14 */ double y2 = input.nextDouble(); /* 15 */ double x3 = input.nextDouble(); /* 16 */ double y3 = input.nextDouble(); /* */ /* */ /* 19 */ double a = Math.sqrt((x2 - x3) * (x2 - x3) + (y2 - y3) * (y2 - y3)); /* */ /* 21 */ double b = Math.sqrt((x1 - x3) * (x1 - x3) + (y1 - y3) * (y1 - y3)); /* */ /* 23 */ double c = Math.sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2)); /* */ /* */ /* */ /* 27 */ double A = Math.toDegrees(Math.acos((a * a - b * b - c * c) / -2.0D * b * c)); /* */ /* 29 */ double B = Math.toDegrees(Math.acos((b * b - a * a - c * c) / -2.0D * a * c)); /* */ /* 31 */ double C = Math.toDegrees(Math.acos((c * c - b * b - a * a) / -2.0D * a * b)); /* */ /* */ /* */ /* 35 */ System.out.println("The three angles are " + ( /* 36 */ Math.round(A * 100.0D) / 100.0D) + " " + ( /* 37 */ Math.round(B * 100.0D) / 100.0D) + " " + ( /* 38 */ Math.round(C * 100.0D) / 100.0D)); /* */ } /* */ } /* Location: /Volumes/TXS.128G/hope useful/practice/2020.jar!/ch04/ComputeAngles.class * Java compiler version: 8 (52.0) * JD-Core Version: 1.1.3 */