Use a protractor to measure angles

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by Dr. Osama M. Khaled last modified 2023-01-30T10:39:49+00:00

How to use protractor to measure angles

Questions #: 15
Time: 10 minutes
Pass Score: 80.0%
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Mode

One unit of measurement of an angle is the degree

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The symbol for degree is a small raised circle, °

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An angle measure of 1° reads as

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An angle measure of 1° meaning

An angle measure of 1° (read as “one degree”) means that one side of an angle is rotated ________ of a complete revolution about the vertex from the other side of the angle

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Angle reading symbols

The measure of ∠ ABC , shown below, is 1°. We can write this in symbols as m(∠ ABC) = 1°

1_degree_angle.jpg

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An angle measure equivalency

  • An angle measure of 90° is equivalent to (1) transparent
  • An angle measure of 180° is equivalent to (2) transparent
  • An angle measure of 270° is equivalent to (3) transparent
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\(\frac{1}{4}\)
\(\frac{3}{4}\)
\(\frac{1}{2}\)
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Match angles to the diagrams

  •  (1) transparent

 

  •  (2) transparent

 

  •  (3) transparent
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m(∠FED) = 270°
m(∠FED) = 180°
m(∠FED) = 90°
m(∠FED) = 360°
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We can use a _________ to measure angles

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Write the correct measure of angles in the below table

  • ABC = °
  • ABD = °
  • ABE = °
  • ABF = °
  • ABG = °
  • GBF = °
  • GBC = °
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When two angles have the same measure, we say that they are ____________

Missing
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Classifying angles

Types of angles
  • (1) transparent : Angles whose measures are greater than 0° but less than 90°.
  • (2) transparent : Angles whose measures are 90°.
  • (3) transparent : Angles whose measures are greater than 90° but less than 180°.
  • (4) transparent : Angles whose measures are 180°
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Straight angles
Acute angles
Obtuse angles
Right angles
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Match angles with diagrams

(1) transparent

(2) transparent

(3) transparent

(4) transparent

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Acute angle
Obtuse angle
straight angle
Right angle
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Right angle symbol

Choose the symbol which is commonly drawn in a right angle

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Classify each angle in the figure as an acute angle, a right angle, an obtuse angle, or a straight angle

Since m(∠1) is an (1) transparent angle.

Since m(∠2) is an (2) transparent  angle.

Since m(∠BDE) is a (3) transparent  angle.

Since m(∠ABC) is a (4) transparent angle

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straight
acute
right
obtuse
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Classify the following angles

  • ∠ DEG is (1) transparent angle
  • ∠ DEF is (2) transparent angle
  • EFG is (3) transparent angle
  • ∠ EGF is (4) transparent angle
  • ∠ GEF is (5) transparent angle

 

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obtuse
straight
acute
right
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