Tracy loves Donuts. She purchased a lots of Donuts for her birthday party. She learnt to calculate the area of the circle a few days back and she is fascinated to know the area of the donuts as well !! Help her finding the area of the Donuts…..

-----Input:-----
- First line will contain, number of testcases. Then the testcases follow. 
- Each testcase contains of a single line of input, where in you have to provide the RADIUS of the Donuts. 

-----Output:-----
For each testcase, output in a single line answer is the AREA of the Donut.

-----Constraints-----
1 <= Radius <= 20.

-----Sample Input:-----
2
5 
12

-----Sample Output:-----
78.5

452.16

Source: codechef | Difficulty: UNKNOWN_DIFFICULTY


Solutions:
oo = int(input())
for i in range(oo):
	val = int(input())
	print(val ** 2 * 3.14)


for _ in range(int(input())):
	n = int(input())
	print(n * n * 3.14)


import math
for _ in range(int(input())):
	r = int(input())
	if r >= 1 and r <= 20:
		print(3.14 * r ** 2)


number_of_test_cases = int(input())
for i in range(0, number_of_test_cases):
	radius = int(input())
	area = 3.14 * radius * radius
	print(round(area, 2))


test = int(input())
while test:
	r = int(input())
	print(round(3.14 * r * r, 2))
	test -= 1


t = int(input())
while t > 0:
	n = int(input())
	print(n * n * 3.14)
	t -= 1


for i in range(int(input())):
	print(pow(int(input()), 2) * 3.14)


t = int(input())
while t:
	r = int(input())
	print(3.14 * r * r)
	t -= 1


PI = 3.14
t = int(input())
for x in range(t):
	r = int(input())
	print(PI * r ** 2)


n = int(input())
for i in range(n):
	r = int(input())
	print(3.14 * r * r)


t = int(input())
for i in range(t):
	r = float(input())
	print(3.14 * r ** 2)


for _ in range(int(input())):
	print(int(input()) ** 2 * 3.14)


N = int(input())
while N > 0:
	N = N - 1
	i = int(input())
	a = 3.14 * (i * i)
	print(a)


for t in range(int(input())):
	r = int(input())
	area = 3.14 * r ** 2
	print(area)


try:
	t = int(input())
	while t != 0:
		r = int(input())
		area = 3.14 * r * r
		print(area)
		t = t - 1
except:
	pass