The answer is c because a the radius of a circle is the length of the from it’s center to any point of it’s edge
It has been 1 hour and 20 minutes.
HOW I FOUND MY ANSWER:
7:10 to 8:10 = 1 hour
8:10 to 8:30 = 20 minutes
(1 hour + 20 minutes = 1 hr and 20 min.)
HOPE THIS HELPED
:)