In this post, we are going to learn Python Program to find area of triangle using coordinates. We will define a class and function to make code reusable

### 1. Python program to find area of triangle using coordinates

The coordinates for all three sides of the triangle are **A(x1, y1), B(x2, y2), and C(x3, y3)**. So by using these coordinates we can calculate the area of the triangle with the help of a mathematical formula given below.

- We can use different ways to find areas of the circle also in python.
- The
**abs()**function helps us to get the absolute result of the calculated area of a triangle.

**Formulas to find the area of a triangle using coordinates **

```
(0.5)(x1(y2-y3)+x2(y3-y1)+x3(y1-y2))
#formula Using abs() function
abs((0.5)*(x1*(y2-y3)+x2*(y3-y1)+x3*(y1-y2)))
```

**Python Program Example**

In this example, we are asking the user to input all coordinates of the triangle and using the formula **Triange_Area = abs((0.5)(x1(y2-y3)+x2(y3-y1)+x3(y1-y2))) ** to find the triangle area.

If the area of a triangle is zero then the printing message **“A Triangle cannot be draw by given input coordinates!”**

```
x1 = int(input("Enter the value of x1 :"))
y1 = int(input("Enter the value of y1 :"))
x2 = int(input("Enter the value of x2 :"))
y2 = int(input("Enter the value of y2 :"))
x3 = int(input("Enter the value of x3 :"))
y3 = int(input("Enter the value of y3 :"))
Triange_Area = abs((0.5)*(x1*(y2-y3)+x2*(y3-y1)+x3*(y1-y2)))
print("calculated Area of the Triangle is :",Triange_Area)
if Triange_Area == 0:
print("A Triangle cannot be draw by the input coordinates!")
```

Output

```
Enter the value of x1 :0
Enter the value of y1 :0
Enter the value of x2 :2
Enter the value of y2 :4
Enter the value of x3 :5
Enter the value of y3 :6
calculated Area of the Triangle is : 4.0
```

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### 2. Python program to find area of triangle using coordinates in function

In this Python program, we have defined a function triangle area() that takes coordinates of the triangle arguments.

- Using the formula =
**abs((0.5)**to find triangle area.*(x1*(y2-y3)+x2*(y3-y1)+x3*(y1-y2))) - Finally calling the function
**triangeArea()**and print the result to the output.

#### Python Program

```
#defing triangeArea() to find area of traingle using coordinates
def triangeArea(x1,y1,x2,y2,x3,y3):
Triange_Area = abs((0.5)*(x1*(y2-y3)+x2*(y3-y1)+x3*(y1-y2)))
print("calculated Area of the Triangle is :",Triange_Area)
if Triange_Area == 0:
print("A Triangle cannot be formed using the input coordinates!")
x1 = int(input("Enter the value of x1 :"))
y1 = int(input("Enter the value of y1 :"))
x2 = int(input("Enter the value of x2 :"))
y2 = int(input("Enter the value of y2 :"))
x3 = int(input("Enter the value of x3 :"))
y3 = int(input("Enter the value of y3 :"))
#calling triangeArea() to find area of traingle
triangeArea(x1,y1,x2,y2,x3,y3)
```

Output

```
Enter the value of x1 :0
Enter the value of y1 :0
Enter the value of x2 :7
Enter the value of y2 :8
Enter the value of x3 :9
Enter the value of y3 :4
calculated Area of the Triangle is : 22.0
```

### 3. Python program to find area of triangle using coordinates in class

We have defined a class name **Triangle** with the method **triangeArea(self):**

- We will ask the user to enter all coordinates of the triangle.
- We have created the object of class Triangle.
- By using the object of class we are calling the function
**Triangle_area()**.

#### Python Program

```
#defing triangeArea() to find area of traingle using coordinates
class Triangle:
def __init__(self,x1,y1,x2,y2,x3,y3):
self.x1 = x1
self.y1 = y1
self.x2 = x2
self.y2 = y2
self.x3 = x3
self.y3 = y3
def triangeArea(self):
Triange_Area = abs((0.5)*(self.x1*(self.y2-self.y3)+self.x2*(self.y3-self.y1)+self.x3*(self.y1-self.y2)))
print("calculated Area of the Triangle is :",Triange_Area)
if Triange_Area == 0:
print("A Triangle cannot be formed using the input coordinates!")
x1 = int(input("Enter the value of x1 :"))
y1 = int(input("Enter the value of y1 :"))
x2 = int(input("Enter the value of x2 :"))
y2 = int(input("Enter the value of y2 :"))
x3 = int(input("Enter the value of x3 :"))
y3 = int(input("Enter the value of y3 :"))
#creating class Triangle object
obj = Triangle(x1,y1,x2,y2,x3,y3)
#calling the class method Triangle_area()
obj.triangeArea()
```

Output

```
Enter the value of x1 :0
Enter the value of y1 :0
Enter the value of x2 :7
Enter the value of y2 :8
Enter the value of x3 :9
Enter the value of y3 :4
calculated Area of the Triangle is : 22.0
```

### Summary

In this post, we have learned Python Program to find the area of triangles using coordinates also covered Python Program to find the area of triangles using coordinates with function Python Program to find the area of triangles using coordinates in class.