2. The minute hand rotates every hour to form a circle, so the distance traveled by the tip of the minute hand is the circumference of the circle, the radius of the circle is 100 mm, the circumference l=πd=3. 14*200=628 (mm), and the area of the circle is S = π * r * r = 3.
So every hour, the tip of the minute hand passes 628 mm, and the swept area is 3 1400 square mm.