Answers:
15 . π (No)
30 . π (No)
15² . π (Yes)
30² . π (Yes)
15 . 15 . π (Yes)
Explanation:
The area of a circle is A = πr². (15²), (30²), and (15 . 15) can be considered the radii (plural of radius) multiplied with pi (π) to get the area of a circle. The first two answers do not square the 15 and 30 hence they cannot be used to find the area of a circle. The dots simply mean the multiplication symbol (don't let them confuse you lol)