The formula of an area of a triangle:

We have:

substitute:

The formula of an area of a circle:

We have 
Substitute:

The area of the shaded region

<span>First of all, we need to put commas in the number so it would look less confusing
309 , 099 , 990
Hundred million hundred of thousnd Hundred
So the correct way to say it would be : three hundred nine million ninety nine thousand nine hundred and ninetyHope this helps. Let me know if you need additional help!</span>
Y=6
i hope you understand
3. 572/1000 4. 9 23/1000 5. 45/100000 6. 9 875/1000