21 .,plot a distance-time graph of the tip of the second hand of a clock by selecting 4 points on x-axis and y-axis respectively. the circumference of the circle traced by the second hand is 64 cm

i don't see a text, but i am gonna assume this *orbit* the curved path, usually elliptical, described by a planet, satellite, spaceship, etc., around a celestial body, as the sun.

what is the question here. i think you messed up.