### Perimeters and areas of Triangle

the mathematical equation to calculate the perimeter and area of a Triangle with height(h), length(l) and width(w) is :

`p= h+l+w`

a=1/2(l*w)

so with python it can be executed as

```
length=float(input("Enter length : "))
width =float(input("Enter width : "))
height=float(input("Enter height: "))
print("the perimetre of the triangle is : " +str(length+width+height))
print("the area of the triangle is : " +str(1/2*(length*width)))
```

and the output will be

Enter length : 2

Enter width : 3

Enter height: 4

the perimeter of the triangle is : 9.0

the area of the triangle is : 3.0

### Perimeters and areas of rectangle

the mathematical equation to calculate the perimeter and area of a Rectangle with length(l) and width(w) is :

p= 2l + 2w

a= l*w

**and the code will be**

```
length=float(input("Enter length : "))
width =float(input("Enter width : "))
print("the perimeter of the rectangle is : "+str(2*length+2*width))
print("the area of the rectangle is : "+str(length*width))
```

and the output will be

Enter length : 2

Enter width : 3

the perimeter of the rectangle is : 10.0

the area of the rectangle is: 6.0

### Perimeters and areas of Circle

the mathematical equation to calculate the perimeter and area of a Circle with radius(r) is :

`p= 2*PI*r`

a=PI*r**2

so with python it can be executed as

```
from math import pi
r=float(input("Enter radius : "))
print("the Perimetre of the circle with radius "+str(r)+" is : " +str(2*pi*r))
print("the area of the circle with radius "+str(r)+" is : " +str(pi*r**2))
```

and the output will be

`Enter radius : 3`

the Perimeter of the circle with radius 3.0 is : 18.84955592153876

the area of the circle with radius 3.0 is : 28.274333882308138

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