Answer:
2π
Step-by-step explanation:
Area = πr^2
= π2^2
= 4π
4π is the area of the whole circle, so divide it in half to get the semicircle.
<u>= 2π</u>
Answer: b
Explanation: A and C are wrong because a negative times a positive is a negative
And D is wrong because a positive times a positive is a positive
Yes, because there is no other way to be more simpler
I've done it on the attached pages.
I hope this helps you...