Step 1 :

The diameter of circle is $\"\"$ .

$\"\"$

The length of rectangle is $\"\"$ .

The width of rectangle is $\"\"$ .

The area of circle is $\"\"$ .

Substitute $\"\"$ .

$\"\"$

The area of rectangle is $\"\"$ .

Substitute $\"\"$ and $\"\"$ .

$\"\"$

Step 2:

The area of the shape in grey is $\"\"$

Substitute $\"\"$ and $\"\"$ .

The area of the shape in grey colour is $\"\"$

$\"\"$

Therefore, the area of the shape in grey colour is $\"\"$

Solution:

The area of the shape in grey colour is $\"\"$ .