Answer:
Written using C++
/*Enter Your Details Here*/
#include<iostream>
#include<cmath>
using namespace std;
int main()
{
//1
float side;
cout<<"Enter the side of a square: ";
//2
cin>>side;
//3
float perimeter = 4 * side;
cout<<"The perimeter is "<<perimeter<<endl;
//4
float area = side *side;
cout<<"The area is "<<area<<endl;
//5
float diagonal = sqrt(2 * side * side);
cout<<"The length of the diagonal is "<<diagonal;
return 0;
}
Explanation:
<em>I've added the full source code as an attachment where I used more comments to </em><em>explain </em><em>difficult line</em>
The default name for an event procedure that will be executed when the user clicks on the control will be btnDisplayListclick.
<h3>What is a default name?</h3>
It should be noted that a default name means a name that's assigned to a folder that's created in a computer.
In this case, the default name for an event procedure that will be executed when the user clicks on the control will be btnDisplayListclick.
Learn more about default on:
brainly.com/question/23976472
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