Triangular rulers are less likely to use in lower grades compared to scale rulers.Īn angle, an important mathematical concept that would be introduced to children in higher grades, can be measured using a protractor. Triangular scale rulers have different units on each of the sides. The below picture is of a centimeter ruler that measures up to 20 cm. Line segments can be measured using scale rulers. There are many types of rulers serving different purposes. In mathematics, children need to measure many things like a line segment, angles, sector etc. Rulers are mainly used for three purposes: to measure, to draw straight lines and as a straight guide for cutting with a blade. Lengths are more important than many other measurements in the fields of geometry, technical drawing, civil engineering etc. Customary units are widely used in the United States of America. Capacity can also be measured and the customary units are ounces, pints, cups, quarts, gallon etc. Customary units for length include inches, feet, yards, miles etc. For measuring lengths the metric units are millimeter, centimeter, meter, kilometer etc. Metric units for weight include milligram, gram, kilogram etc while customary units are ounces, pound, ton etc. For measuring weights, capacity, and length, there are mainly two types of units: metric units and customary units. Time can be measured in seconds, minutes and hours. One can measure time, weight, length, capacity etc. A Dutch proverb says “Measure thrice before you cut once”, this explains the importance of any type of measurements in one’s life.
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