Area calculator v2

Area calc V2.py

##Area Calculator Version 2
import math
import sys
import time

def area_rect(x,y):
    rect=x*y
    return rect
def area_square(x):
    sq=x**2
    return sq
def area_tri(x,y):
    tri=(x*y)/2
    return tri
def area_sphere(x):
    sp=4*(math.pi)*(x**2)
    return sp
def area_circle(x):
    circ=(math.pi)*(x**2)
    return circ

print("Welcome to the area calculator")
time.sleep(1)
print("This little program only calculates the areas of rectangle, square,triangle, sphere and circle")
time.sleep(1)
usr_input= str.lower(input("Please enter the object's name: "))

if usr_input=="rectangle":
    x= float(input("Please enter a side's length of your rectangle: "))
    y= float(input("Please enter the other side's length: "))
    print("Area of your object is:",area_rect(x,y))
    time.sleep(2)
    print("Thank you.")
elif usr_input=="square":
    x= float(input("Please enter a side's lenght of your square: "))
    print("Here's the area: ",area_square(x))
    time.sleep(2)
    print("Thanks for your time.")
elif usr_input=="triangle":
    x= float(input("Please enter the triangle's height: "))
    y= float(input("Please enter the triangle's side length: "))
    print("Here's the area you wanted: ",area_tri(x,y))
    time.sleep(2)
    print("Goodbye")
elif usr_input=="sphere":
    x= float(input("Please enter the radius: "))
    print("Here you go: ",area_sphere(x))
    time.sleep(2)
    print("Say cheese")
elif usr_input=="circle":
    x= float(input("Please enter the radius of your circle: "))
    print("Here is the area: ",area_circle(x))
    time.sleep(2)
    print("See you again")
else:
    print("I don't do that")
    time.sleep(1)
    print("END")