# Three sides of the triangle is a, b and c:  

a = float(input('Enter first side: '))  

b = float(input('Enter second side: '))  

c = float(input('Enter third side: '))  

  

# calculate the semi-perimeter  

s = (a + b + c) / 2  

  

# calculate the area  

area = (s*(s-a)*(s-b)*(s-c)) ** 0.5  

print('The area of the triangle is %0.2f' %area)   

4) Python program to solve quadratic equation

​

Quadratic equation:

Quadratic equation is made from a Latin term "quadrates" which means square. It is a special type of equation having the form of:

ax2+bx+c=0

Here, "x" is unknown which you have to find and "a", "b", "c" specifies the numbers such that "a" is not equal to 0. If a = 0 then the equation becomes liner not quadratic anymore.

​

In the equation, a, b and c are called coefficients.

Let's take an example to solve the quadratic equation 8x2 + 16x + 8 = 0

​

See this example:

# import complex math module  

import cmath  

a = float(input('Enter a: '))  

b = float(input('Enter b: '))  

c = float(input('Enter c: '))  

  

# calculate the discriminant  

d = (b**2) - (4*a*c)  

  

# find two solutions  

sol1 = (-b-cmath.sqrt(d))/(2*a)  

sol2 = (-b+cmath.sqrt(d))/(2*a)  

print('The solution are {0} and {1}'.format(sol1,sol2))