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Types of Geometry Angles
Chris West
9/11/14
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Table Of Contents
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Angle Types We Will Cover
Degrees (Angles)
Congruent Angles
Parallel Lines and Pairs of Angles
Vertically Opposite Angles
Corresponding Angles
Alternate Interior Angles
Alternate Exterior Angles
Consecutive Interior Angles
Supplementary Angles
Complementary Angles
Summary
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Angle Types We Will Cover
•
•
•
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•
•
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Congruent Angles
Vertically Opposite Angles
Corresponding Angles
Alternate Interior Angles
Alternate Exterior Angles
Consecutive Interior Angles
Supplementary Angles
Complementary Angles
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Degrees (Angles)
We can measure Angles in Degrees. There are 360
degrees in one Full Rotation(one complete circle
around).
Half a circle is 180 degrees.
Quarter of a circle is 90 degrees(Right Angle).
We often measure degrees using a protractor.
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Congruent Angles
Congruent Angles have the same angle.
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Parallel Lines and Pairs of Angles
Lines are parallel if they are always the same
distance apart (called “equidistant”), and will
never meet.
When parallel lines get crossed by another
line(which is called a Transversal), the angles can
be made into pairs of angles which have special
names.
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Vertically Opposite Angles
Vertically Opposite Angles are the angles opposite
each other when two lines cross.
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Corresponding Angles
When two lines are crossed by another line ( called
the Transversal), the angles in the matching corners
are called Corresponding Angles.
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Alternate Interior Angles
When two lines are crossed by another line ( called
the Transversal), the pairs of angles on opposite
sides of the transversal but inside the two lines are
called Alternate Interior Angles.
If the two lines being crossed are Parallel Lines
Then the Alternate Interior Angles are equal
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Alternate Exterior Angles
When two lines are crossed by another line ( called
the Transversal), the pairs of angles on opposite
sides of the transversal but outside the two lines
are called Alternate Exterior Angles.
If the two lines being crossed are Parallel Lines
Then the Alternate Exterior Angles are equal
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Consecutive Interior Angles
When two lines are crossed by another line ( called
the Transversal), the pairs of angles on one side of
the transversal but inside the two lines are called
Consecutive Interior Angles.
If the two lines being crossed are Parallel Lines
Then the Consecutive Interior Angles add up to 180
degrees.
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Supplementary Angles
Two angles are Supplementary if they add up to 180
degrees.
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Complementary Angles
Two angles are complementary when they add up
to 90 degrees.
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Summary
We covered the following angles:
• Congruent Angles
• Vertically Opposite Angles
• Corresponding Angles
• Alternate Interior Angles
• Alternate Exterior Angles
• Consecutive Interior Angles
• Supplementary Angles
• Complementary Angles
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