Area and Circumference of Circle Using javascript

In this article, we are going to learn how to calculate the area and circumference of a circle using javascript. In this program, we are going to use prompt () to input data and calculate area and circumference without using function and event.

 

Also read :JavaScript while loop

Formula:

Area=PI X radius X radius

Circumference=2 X PI X radius

Note: In the Greek letter PI (π) represents a constant, approximately equal to 3.14159. The result will display in the floating point.

Also read :JavaScript 'for' loop

Source Code:

 

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Explanation:

In the above program, we input the data with the help of prompt() and the value is stored in the variable radius. parseInt function converts the input data into numbers.

Now, we calculate the area of the circle using the formula π * r^2 and the circumference of the circle using the formula 2 * π * r where, π is the value of pi (approximately 3.14) and r is the radius of the circle. After calculating the area and circumference stored in the variable area and cir respectively.

Now, document.write() statement display the output on the page.

Output:

Also read :JavaScript check if number is negative or positive

 

Final Words:

I hope you understood how to calculate the Area and Circumference of Circle Using javascript. In the next article, we are going to solve the same problem by using functions and buttons. If you have any suggestions, please feel me to write it comment box.

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