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Section 2


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Section 2

  1. 1. 1.2 Linear Measure and Precision
  2. 2. Objective <ul><li>Measure segments and determine accuracy of measurement. </li></ul><ul><li>Compute with measures. </li></ul>
  3. 3. Measure line segments <ul><li>Unlike a line, a line segment , or segment, can be measured because it has two endpoints. </li></ul><ul><ul><li>A segments with endpoints A and B can be named as or . </li></ul></ul>
  4. 4. Read get ready for the lesson and then answer the following. <ul><li>What is another part of the body that is used as a unit of measure? </li></ul><ul><li>Is a foot a customary unit or metric unit? </li></ul><ul><li>Which system of measure uses fractions and whole numbers? </li></ul><ul><li>Which system of measure uses decimals? </li></ul>
  5. 5. Examples <ul><li>Use a metric rule to draw each segment. </li></ul><ul><ul><li>, 42 millimeters long </li></ul></ul><ul><ul><li>, 5 centimeters long </li></ul></ul>
  6. 6. Examples <ul><li>Use a customary ruler to draw each segment. </li></ul><ul><ul><li>, 3 inches long </li></ul></ul><ul><ul><li>, inches long </li></ul></ul>
  7. 7. Precision <ul><li>The precision of any measurement depends on the smallest unit available on the measuring tool. </li></ul><ul><li>The measurement should be precise to within 0.5 units of measure. </li></ul>
  8. 8. Example <ul><li>Find the precision for each measurement. Explain its meaning. </li></ul><ul><ul><li>32 inches </li></ul></ul><ul><ul><li>15 millimeters </li></ul></ul>
  9. 9. Calculate Measures <ul><li>When segments have the same measure they are said to be congruent. </li></ul>
  10. 10. Constructions <ul><li>Constructions are methods of creating geometric figures without the benefits of measure tools. Generally, only a pencil, straightedge, and compass are used. You can construct a segment that is congruent to a given segment. </li></ul><ul><li>See example on page 16. </li></ul>