I really need help on these I'm not really good at circles :(

Answer:
1. 13.962634, ~13.96
2. 21.3802833, ~21.38
Step-by-step explanation:
1. r=4, d=8
C=pi*d=8pi
180 +20˚=200˚
8pi =25.1327412
200/360=5/9
5/9 of 25.1327412=13.962634
2.
5/36 is shaded
A=pi*r^2=49pi=153.93804
5/36 of it is 21.3802833