A circular pen has an area of 64pi square yards. What is the circumference of the pen? Give your answer in terms of pi. (Please answer the question and explain your answer. I will be marking BRAINIEST! :)

Alex drew a circle with right triangle prq inscribed in it, as shown below: the figure shows a circle with points p, q, and r on it forming an inscribed triangle. side pq is a chord through the center and angle r is a right angle. arc qr measures 80 degrees.

Yoku is putting on sunscreen. he uses 2\text{ ml}2 ml to cover 50\text{ cm}^250 cm 2 of his skin. he wants to know how many milliliters of sunscreen (c)(c) he needs to cover 325\text{ cm}^2325 cm 2 of his skin. how many milliliters of sunscreen does yoku need to cover 325 \text{ cm}^2325 cm 2 of his skin?

Ben is three times as old as samantha, who is two years older than half of michel's age. if michel is 12. how old is ben?