Use a protractor to measure angles

One unit of measurement of an angle is the degree

True

False

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The symbol for degree is a small raised circle, °

True

False

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An angle measure of 1° reads as

degree

one degree

null degree

dot degree

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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

$\frac{1}{60}$

$\frac{1}{90}$

$\frac{1}{180}$

$\frac{1}{360}$

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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°

$1_degree_angle.jpg$

True

False

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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

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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

ruler

protractor

compass

triangle

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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) : 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) 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) 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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