# File: peri2.py
# Compute the perimeter of a triangle; user enters the points defining it
# WARNING: input is not error checked (see peri-c.py for how to do it right)
#
# Matt Bishop, ECS 10, Spring 2014
#
import math             # load up the math functions

#
# compute the distance between two points (x1, y1) and (x2, y2)
#
def dist(x1, y1, x2, y2):
    temp = (x1 - x2) ** 2 + (y1 - y2) ** 2
    return math.sqrt(temp)

#
# construct the prompts
#
def prompt(xory, which):
    s = "Please enter the " + xory + " coordinate of the " + which + " point: "
    return s

#
# read in the co-ordinates
#
#iax = float(input("Please enter the x coordinate of the first point: "))
iax = float(input(prompt("x", "first")))
#iay = float(input("Please enter the y coordinate of the first point: "))
iay = float(input(prompt("y", "first")))
#ibx = float(input("Please enter the x coordinate of the second point: "))
ibx = float(input(prompt("x", "second")))
#iby = float(input("Please enter the y coordinate of the second point: "))
iby = float(input(prompt("y", "second")))
#icx = float(input("Please enter the x coordinate of the third point: "))
icx = float(input(prompt("x", "third")))
#icy = float(input("Please enter the y coordinate of the third point: "))
icy = float(input(prompt("y", "third")))

#
# compute the corresponding triangle's perimeter
#
d1 = dist(iax, iay, ibx, iby)
d2 = dist(iax, iay, icx, icy)
d3 = dist(ibx, iby, icx, icy)
temp = d1 + d2 + d3

#
# print the corresponding triangle's perimeter
#
print("The perimeter is", temp)