TLE: Lesson 1 - 5

• Angle


  Geometrical figure composed of two straight lines intersecting at one of their extremities
• Calculation


  Act or process of or result of calculating
• Circle


  Closed curve where all points are equally distant from the center
• Concentric circles


  Consist of two or more circles with a common center
• Decimal number


  Expressed in a counting system that uses units of 10, especially a decimal fraction
• Dimension


  Measurable extent of length, thickness and width
• Eccentric circles


  Circles having no common center
• English system


  Scaled in inches where one foot equals 12 inches
• Formula


  Special kind of equation. It is a mathematical rule expressing the relationship of two or more quantities by means of numerals, variables and operating symbols
• Geometric shapes


  Characterized by straight lines, regular curves, and angles
• Graduation


  Scale of a measuring tool
• Mensuration


  Act of measuring
• Metric system


  System of measurement based on the meter
• Perpendicular lines


  Lines which make a 90° angle with each other
• Radius


  Length of a straight line connecting the center of a circle with a point on the circumference of a circle
• Standard


  Measure of reference
• Types of Measuring Tools

  • T-square
  • Triangles
  • Ruler
  • Triangular Scale
  • Protractor
  • Tape or tape ruler
  • Compass
  • Divider
• How to take care of drafting measuring tools

  1. Inspect measuring tools before using

  2. Clean thoroughly with damp cloth after use

  3. Hang T-square when not in use

  4. Do not abuse or misuse

  5. Hand over instead of throwing
• 1 foot


  12 inches
• 1 meter


  100 centimeter
• 1 meter


  10 decimeter
• 1 dm


  10 centimeter
• 1 cm


  10 millimeter
• 1 inch


  2.54 cm
• Angle


  Geometrical figure composed of two straight lines intersecting at one of their extremities
• Calculation


  Act or process of or result of calculating
• 1 inch


  25.4 mm
• Circle


  Closed curve where all points are equally distant from the center
• 1 foot


  30.48 cm
• Concentric circles


  Consist of two or more circles with a common center
• 1 meter


  3.28 feet
• Decimal number


  Expressed in a counting system that uses units of 10, especially a decimal fraction
• 1 meter


  39.37 inches
• Dimension


  Measurable extent of length, thickness and width
• Eccentric circles


  Circles having no common center
• English system


  Scaled in inches where one foot equals 12 inches
• Formula


  Special kind of equation. It is a mathematical rule expressing the relationship of two or more quantities by means of numerals, variables and operating symbols
• Geometric shapes


  Characterized by straight lines, regular curves, and angles
• Graduation


  Scale of a measuring tool
• Mensuration


  Act of measuring