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 Reading a Protractor or a Ruler, a selection of answers from the Dr. Math archives. Using a Protractor: Measuring Angles with a Protractor I want to know how to measure acute, reflex and obtuse angles with a protractor. How do I measure angles using a protractor? How do I measure angles using a protractor? Reading a Ruler: Reading a Ruler I need to read a ruler, and I can't. Can you help me? Reading a Ruler II What do the little lines on a ruler stand for? Finding Fractions on a Ruler How can I find measurements like 7/8" or 5/16" on a ruler? Metric and Standard Rulers In the United States we only use a customary (standard) ruler, and in other parts of the world they use the metric side. Why do we just use the standard side? Teaching the Metric System How can I teach my second grader about the metric system? I have no idea how to read a metric ruler or how to convert inches into the metric system or vice versa.