# Answer to Question #19289 in C++ for vicky

Question #19289

Create a header file named MyTriangle.h that contains the following two functions:

// return true if the sum of any two sides is greater than the third side//

bool isValid( double side1, double side2, double side3)

//Return the area of a triangle//

double area (double side1, double side2, double side3)

Implement the header file and write a test program that reads three sides of a triangle and compute the area if the input is valid. Otherwise display the input is invalid.

The formula is as follows:

s = (side1 + side2 + side3) / 2;

area = √(s (s-side1)(s-side2)(s-side3))

// return true if the sum of any two sides is greater than the third side//

bool isValid( double side1, double side2, double side3)

//Return the area of a triangle//

double area (double side1, double side2, double side3)

Implement the header file and write a test program that reads three sides of a triangle and compute the area if the input is valid. Otherwise display the input is invalid.

The formula is as follows:

s = (side1 + side2 + side3) / 2;

area = √(s (s-side1)(s-side2)(s-side3))

Expert's answer

#include <stdio.h>

#include <iostream.h>

#include <math.h>

bool isValid( double side1, double side2, double side3){

if (side3<side1+side2) return 1;

else return 0;

}

double area (double side1, double side2, double side3){

double s = (side1 + side2 + side3) / 2;

return sqrt((s*(s-side1)*(s-side2)*(s-side3)));

}

void main(){

double s1, s2, s3;

cout<<"enter the first side: ";

cin>>s1;

cout<<"enter the second side: ";

cin>>s2;

cout<<"enter the third side: ";

cin>>s3;

if (isValid(s1,s2,s3))

& cout<<area(s1,s2,s3)<<"\n";

else cout<<"input is invalid\n";

}

#include <iostream.h>

#include <math.h>

bool isValid( double side1, double side2, double side3){

if (side3<side1+side2) return 1;

else return 0;

}

double area (double side1, double side2, double side3){

double s = (side1 + side2 + side3) / 2;

return sqrt((s*(s-side1)*(s-side2)*(s-side3)));

}

void main(){

double s1, s2, s3;

cout<<"enter the first side: ";

cin>>s1;

cout<<"enter the second side: ";

cin>>s2;

cout<<"enter the third side: ";

cin>>s3;

if (isValid(s1,s2,s3))

& cout<<area(s1,s2,s3)<<"\n";

else cout<<"input is invalid\n";

}

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