Question is in the image! If you can work this out you are legendary! I'll give brainliest instantly :p

Answer:
14.1371669412
Step-by-step explanation:
[tex]\pi \times {radius}^{2} \div 2\p[/tex]
[tex]\pi \times {3}^{2} \div 2[/tex]
[tex]\pi \times 9 \div 2[/tex]
[tex]28.2743338823 \div 2[/tex]
That is how you get 14.1371669412cm