Geometry help please

[Guest]

If anyone can point me in the right direction please. For #3-5 can i create a triangle, out of all 3 problems, obviously #3 is already a right triangle. And apply pythagoras therom to solve for the other side? Then find the areaof the triangle and deduct that area from the total area of the circle to find ab?

for questions 1& 2 i am at a total loss. Any help and guidance would be greatly appreciated. Remember im learning. Thank you so much. Have a nice day.

[shyamjayakannan]

i think the image and the question do not match.