Geometry help. Area of a shaded region

[Guest]

Please help me solve. The book doesnt show me proper examples.

[Guest]

I think the answer to number 1 is 63.0 or 60 if rounded to the nearest tenth, and i think number 2 is. 96.0 or 100 if rounded to the nearest tenth. Need help with 3 and 4. I think for 3 i would add 6 and 8 as the diagonal going down and the vertical diagonal would be 5 . 6+8=14 so the area would =35(rounded to nearest tenth would be 40) am i correct? Number 4 is where i get completely lost.

[Math Tutor]

Here are the formulas:
https://www.math10.com/en/geometry/circ ... sectorarea

https://www.math10.com/en/geometry/circ ... rcularring