Giving brainliest for the correct answer!!!! As long as you explain!

Answer: 5 is the radius because it is half of 10 in the circle
Step-by-step explanation:
Answer:
Circumference is 31.4.
Area is 78.4^2.
Step-by-step explanation:
Circumference = pi times diameter.
3.14 times 10 is 31.4.
Area = 1/4 pi diameter squared.
10^2 = 100
100 times 3.14 = 314
314 times 1/4 is 78.5.
I hope this helps you!