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When do we need to use …

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When do we need to use the inner side of the protector
  • 1 answers

Meghna Thapar 5 years, 6 months ago

Read the degree marking where the ruler crosses the curved edge of the protractorYou'll notice two sets of degrees along the edge: an inner and outer scale. Both scales go from 0 to 180, but they run in opposite directions. If the angle opens to the right side of the protractor, use the inner scale.

an obtuse angle; 127°

a right angle; 90°

How to measure an angle with a <i>protractor</i>:

  • Place the midpoint of the protractor on the VERTEX of the angle.
  • Line up one side of the angle with the zero line of the protractor (where you see the number 0). 
  • Read the degrees where the other side crosses the number scale.
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