Question

Write a menu driven program to find the area of an Equilateral Triangle, an Isosceles Triangle

and a Scalene Triangle as per the user’s choice.

1. Equilateral Triangle= √3/4 s2

, s=side of an equilateral triangle

2. Isosceles Triangle= ¼ b*√4a2 – b

2

3. Scalene Triangle= √s(s-m) (s-n) (s-p), s=m+ n+ p
(where m, n and p are three sides of a scalene triangle)​

Answer 1

formula of equilateral = root by 4 s2

Answer 2

Answer:

Explanation:

import java.io.*;

public class triangle

{

public static void main(String args[]) throws IOException

{

InputStreamReader read = new InputStreamReader(System.in);

BufferedReader in = new BufferedReader(read);

int c;

float a,s,p,q,r,b;

double area;

System.out.println("1.Area of equilateral triangle");

System.out.println("2.Area of isosceles triangle");

c=Integer.parseInt(in.readLine());

switch(c)

{

case 1:

System.out.println("Enter side of an equilateral triangle");

s=Float.parseFloat(in.readLine());

area=Math.sqrt(3*s*s)/4;

System.out.println("Area="+area);

break;

case 2:

System.out.println("Enter the side and base of isosceles triangle");

a=Float.parseFloat(in.readLine());

b=Float.parseFloat(in.readLine());

area=b/4*(Math.sqrt(4*a*a-b*b));

System.out.println("Area="+area);

break;

default:

System.out.println("Wrong choice ");

}

}

}

Hope it helps!