# Use a protractor to measure angles

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How to use protractor to measure angles

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

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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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#### Explanation

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

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#### An angle measure equivalency

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

•  (1)

•  (2)

•  (3)
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m(∠FED) = 270°
m(∠FED) = 180°
m(∠FED) = 90°
m(∠FED) = 360°
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• ABC = °
• ABD = °
• ABE = °
• ABF = °
• ABG = °
• GBF = °
• GBC = °
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Missing
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#### Classifying angles

Types of angles
• (1) : Angles whose measures are greater than 0° but less than 90°.
• (2) : Angles whose measures are 90°.
• (3) : Angles whose measures are greater than 90° but less than 180°.
• (4) : 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)

(2)

(3)

(4)

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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) angle.

Since m(∠2) is an (2)  angle.

Since m(∠BDE) is a (3)  angle.

Since m(∠ABC) is a (4) angle

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straight
acute
right
obtuse
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#### Classify the following angles

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

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obtuse
straight
acute
right
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