Answer:
C = 11.18 D= 20
Step-by-step explanation:
Let's start with C
Square root both areas of the squares


Then use the Pythagoras Theorem: 

= C
Moving on to D
Square root both areas of the squares


29 is the hypotenuse, we are trying to find the other leg, so:

= D
Answer:
It's numder 1 (area of circle O)