Question

write a program in Python enter the radius and calculate the perimeter of the circle​

Answer 1

Hey there!!

To do this, we will need to know the formula for the perimeter of the circle

The formula : 2π2.

π has many digits, we can not enter it on python. There are two ways, one, use 22/7 or import pi from math

It will give us the same number.

First method:

radius = float(input('Enter the radius:'))

print('The perimeter of the circle is:', (2)*(22/7)*(radius))

Second method:

from math import pi

radius = float(input('Enter the radius of the circle:'))

print('The perimeter of the circle is:',2*pi*radius)

Hope my answer helps! :)

Answer 2

The following codes will have to be typed in script mode, save and then executed.

CODE 1:

r = float(input("Enter the radius of the circle:"))

print("The perimter of the circle is", 2*3.14*r)

OUTPUT:

$\tt Enter\ the\ radius\ of\ the\ circle:$ 5

$\tt The\ perimeter\ is\ 31.4$

CODE 2:

r = float("Enter the radius of the circle:"))

pm = 2*3.14*r

print("The perimeter of the circle is", pm)

OUTPUT:

$\tt Enter\ the\ radius\ of\ the\ circle:$ 5

$\tt The\ perimeter\ of\ the\ circle\ is\ 31.4$

Here, the float() function has been used in order to accept whatever value [fractional/integer], to be calculated. The int() function may be used as well though calculation will not take place if a decimal value has been entered when asked for input.