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Transcript

  • 1. 1.2 Linear Measure and Precision
  • 2. Objective
    • Measure segments and determine accuracy of measurement.
    • Compute with measures.
  • 3. Measure line segments
    • Unlike a line, a line segment , or segment, can be measured because it has two endpoints.
      • A segments with endpoints A and B can be named as or .
  • 4. Read get ready for the lesson and then answer the following.
    • What is another part of the body that is used as a unit of measure?
    • Is a foot a customary unit or metric unit?
    • Which system of measure uses fractions and whole numbers?
    • Which system of measure uses decimals?
  • 5. Examples
    • Use a metric rule to draw each segment.
      • , 42 millimeters long
      • , 5 centimeters long
  • 6. Examples
    • Use a customary ruler to draw each segment.
      • , 3 inches long
      • , inches long
  • 7. Precision
    • The precision of any measurement depends on the smallest unit available on the measuring tool.
    • The measurement should be precise to within 0.5 units of measure.
  • 8. Example
    • Find the precision for each measurement. Explain its meaning.
      • 32 inches
      • 15 millimeters
  • 9. Calculate Measures
    • When segments have the same measure they are said to be congruent.
  • 10. Constructions
    • 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.
    • See example on page 16.