The asnwer will be 3.29. Hundredths are decimals that are composed of two digits. The given number's decimal is set at the thousandths which is why all you have to do is to round off the last digit. Since the last number is 8, you need to add one on the hundredths digit.
A circle is 360° all the way around; therefore, if you divide an arc's degree measure by 360°, you find the fraction of the circle's circumference that the arc makes up. Then, if you multiply the length all the way around the circle (the circle's circumference) by that fraction, you get the length along the arc.
The angle that is complementary to the angle of 22 degrees is the angle of 68 degrees. This is because when you add the two values, their sum equals 90 degrees.