third_angle.py

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#
# Program: Find The Third Angle Of A Triangle
# 
# Description: Program to find the third angle of a triangle when the first two 
# angles have been provided from user input with C++.  The program utilizes the 
# property that the sum of the angles of a triangle must equal 180 degrees.
#
# YouTube Lesson: https://www.youtube.com/watch?v=XWGJQ8CzRls 
#
# Author: Kevin Browne @ https://portfoliocourses.com
#
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# Prompt the user to enter angle1, store the value entered into angle1
angle1 = float(input("angle1: "))

# Prompt the user to enter angle2, store the value entered into angle2
angle2 = float(input("angle2: "))

# Ensure angle1 and angle2 are valid before computing angle3... angle1 and 
# angle2 must both be between 0-180, and we can't have that angle1 + angle2
# is greater than or equal to 180 otherwise angle3 will be negative or zero!
if ((angle1 > 0 and angle1 < 180) and 
    (angle2 > 0 and angle2 < 180) and 
    ((angle1 + angle2) < 180)):
  
  # The sum of the 3 triangle sides must be 180, so if we know angle1 and 
  # angle2 are valid then angle3 must be 180 - angle1 - angle2.    
  angle3 = 180 - angle1 - angle2
  
  # Output angle3
  print("angle3:", angle3)

# Output an error message in the case angle1 and/or angle2 are invalid
else:
  print("angle1 and/or angle2 is invalid!")