Figure 2.6 Measure the Circle Use a metric ruler marked in centimeters (cm) and millimeters (mm).
Micrometers (um) are not marked on the ruler, but remember that
1000 um would fit in between each millimeter hashmark.
1. Measure the diameter of the circle (Fig 2.6).
mm
2. Now, calculate its diameter in micrometers:
um
3. What is the diameter of the circle in nanometers?
nm

here

Explanation:

Wash your hands often. This is especially important before and after preparing food, before eating and after using the toilet.

Get vaccinated. Immunization can drastically reduce your chances of contracting many diseases. Keep your recommended vaccinations up-to-date.

Use antibiotics sensibly. Take antibiotics only when prescribed. Unless otherwise directed, or unless you are allergic to them, take all prescribed doses of your antibiotic, even if you begin to feel better before you have completed the medication.

Stay at home if you have signs and symptoms of an infection. Don't go to work or class if you're vomiting, have diarrhea or are running a fever.