Answer:
A keyboard is one of the primary input devices used with a computer. Similar to an electric typewriter, a keyboard is composed of buttons used to create letters, numbers, and symbols, and perform additional functions. The following sections provide more in-depth information and answers to some of the frequently asked questions about the keyboard.
Keyboard overview
QWERTY keyboard layout
Keyboard ports and interfaces
Types of keyboards
What else can a keyboard do?
Apple keyboards
Laptop keyboards
Smartphone and tablet keyboards
Why is the keyboard an input device?
Does a computer need a keyboard?
What are multimedia keys?
What keys appear twice on a keyboard?
How to use a computer keyboard.
How can I improve my typing?
When was the first keyboard invented?
Keyboard shortcut keys
Related pages
Keyboard help and support.
Explanation:
Answer:
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Answer:
The correct answer to the following question will be "Entity relationship".
Explanation:
- A relationship model for describes interlinked interests in a particular field of knowledge.
- A ER model consists of the types of entities that classify matters of interest and specify relationships around entities that may be instances.
- A relationship model of entity is a visual representation of entities and their relationships, usually used for data organization in databases or data systems in the form of a computer model or even as an entity interaction diagram.
Therefore, "Entity-relationship" is the right answer.
Answer:
#include <iostream>
#include <math.h>
using namespace std;
int main() {
double n;
cout << "Enter the number of sides: ";
cin >> n;
double s;
cout << "Enter the side: ";
cin >> s;
double area = n * s * s /(4.0 * tan(3.14159265 / n));
cout << "The area of the polygon is " << area;
}