# Input angles and check equilateral, isosceles, or scalene triangle in Python

###### if elif - Question 8

In this question, we will see how to input 3 angles of a triangle and check whether it is an equilateral, isosceles or scalene triangle in Python programming using the if elif statement. To know more about if elif statement click on the if elif statement lesson.

**Q8)** Write a program in Python to input 3 angles of a triangle and check whether it is an equilateral, isosceles or scalene triangle.

An equilateral triangle is one whose all angles are equal and the sum of all the angles is 180. An isosceles triangle is one whose any two angles are equal and the sum of all the angles is 180. A scalene triangle is one whose none of the angles are equal but sum of all the angles is 180.

#### Program

```
print('Enter 3 angles of a triangle')
a=int(input())
b=int(input())
c=int(input())
if a+b+c==180:
if a==b and b==c and c==a:
print('Equilateral traingle')
elif a==b or b==c or c==a:
print('Isosceles traingle')
else:
print('Scalen triangle')
else:
print('Invalid input')
```

#### Output

Enter 3 angles of a triangle 45 90 45 Isosceles traingle