The size of the biggest circle from top to bottom is 3 inches, the middle circle is 2 1/2 inches and the smallest circle is 2 inches.

20f3 Part I 1. Measure the length of the radii of the 3 circles 2. Measure the arc length the angle cuts on each circle, labeled S], $2, and 83 respectively, for both angles. To measure the length of the radius use a ruler, to measure the length of the are, take a string, place it carefully on the arc length, mark it with a pen at the beginning and at the end of the arc and then measure the length of it with the ruler.. 3. Find the ratio of the arc length cut by the angle to the radius for each circle. What do you notice? Arc-length-over radius units are called radians. Page 1 of 3 Table 1 r s sir A91 = 90 degrees = radians