Question

Help meeeeeeeeeeeeee

Answer 1

π(r - a)(r + a)

Explanation:

the area (A) of the green region is calculated as

A = area of whole circle - area of yellow circle

= πr² - πa² ← factor out π from each term

= π(r² - a²) ← difference of squares

= π(r - a)(r + a)