Answer:
Part 1: The fractional part of the circumference is 1/4.
Part 2: 100.53 or 100.48 if you use 3.14 as pi
Step-by-step explanation:
Part 1: A circle is 360 degrees and a right angle is 90, so the fractional part is 90/360 or 1/4.
Part 2: 0.5pi*r is the length of the arc. The radius, or r, is 16 cm, a half of 32. It is 2 * pi * 16 = 32 * pi. 32 * pi = 100.53 or 100.48 if you use 3.14 as pi.