# make all of the functions in the "math" module available to this program
import math

# print some mathematical constants
# constants are considered "read-only" variables - you can't change them
print("PI is: ", math.pi)
print("e is: ", math.e)

# call some mathematical functions
print("The square root of 100 is", math.sqrt(100))
print("30 degrees is", math.radians(30), "radians")

# we can also nest together calls to module functions
print("The sine of 90 degrees is:", math.sin(math.radians(90)))