# your code goes here
import math
 
r = 5 # radius
 
circ_a = math.pi*r**2 # area of a circle
print circ_a
 
# Area of a rectangle
 
length = 12
width = 21
rect_a = length*width
 
print "Area of the rectangle is ", rect_a
 
# Area of a triangle
 
base = 3
height = 5
tri_a = base*height/2.0
 
print "Area of the triangle is %f and the area of the circle is %f" % (
	tri_a, circ_a)
 
# Area of a square
 
print "Enter the length of the square's side: "
side = float(raw_input())
 
square_a = side**2
print "The area of your square is %f" % square_a
 

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MS41

1.5