Download Classifying Triangles (based on angles)

Pre-Algebra Enrichment
Classifying Angles
Acute angle- An angle that measures less
than 90 degrees.
 Obtuse angle- An angle that measures
more than 90 degrees and less that 180
degrees.
 Right Angle- An angle that measures 90
degrees.

Question #1
If an angle is 180 degrees it is
a(n)…

Right Angle

Straight Angle

Obtuse Angle

Acute Angle
Sorry!
Your answer was incorrect, please try again!
Correct!
Great job! It is a straight angle. Please
continue.
Classifying Triangles (based on
sides)
Equilateral Triangle- A triangle with three
equal sides
 Isosceles Triangle- A triangle with at least
two equal sides
 Scalene Triangle- A triangle with no equal
sides

Classifying Triangles (based on
angles)




Right Triangle- A triangle containing a right angle
Acute Triangle- A triangle that has three acute
angles
Obtuse Triangle- A triangle that has one obtuse
angle and two acute angles
Equiangular Triangle- A triangle that has three
equal angles
Question #1A
If a triangle has three equal sides it
is called…

Equiangular

Equilateral

Isosceles

Scalene
OOPS!
Sorry, that was incorrect, you better review
your triangle information and then try
again!
Congratulations!
You know your stuff! Continue on to further
test your triangle knowledge.
Question #2
A triangle with an angle greater
than 90 degrees is called…

An acute triangle

An isosceles triangle

An obtuse triangle

A right triangle
Sorry!
Your answer was incorrect, please try again!
Correct!
Great job! It is an obtuse triangle. Please
continue.
Question #3
What kind of triangle is this:

Right Triangle

Scalene Triangle

Neither Right or Scalene

Both Right and Scalene
Incorrect!
Correct!
General Triangle Properties

Triangles are three-sided polygons.

All triangles have an angle sum of 180
degrees based on the Triangle Sum
Theorem.
Question #4
A triangle with 4 sides must have an
angle sum of:

180

360

240

A triangle cannot have 4 sides.
OOPS!
Excellent!
Question #5
What is the angle sum of:

360 degrees

180 degrees

270 degrees

There is no way of knowing what the angle
sum is.
Sorry!
Great Job!
Angle Pairs:

Complementary Angles- angles that have
measures that add to 90 degrees.

Supplementary Angles- angles that have
measures that add to 180 degrees.
Question #6
The following angles are considered…

Complementary

Supplementary

Complementary and Supplementary

None of the Above
Incorrect
Correct!
Question #7
A 6 sided figure is called what and has a
degree measure of what?

Hexagon, 540

Hexagon, 720

Heptagon, 540

Heptagon, 720
OOPS!
Excellent!
Congruency

Congruent is another word for equal.
Question #8
The second angle of a triangle is two times the
measure of the first angle. The third angle is 3
times the measure of the second angle what is the
measure of each angle?

1st- 30º, 2nd- 60º, and 3rd- 90º

1st- 20º, 2nd- 40º, and 3rd- 120º

1st- 20º, 2nd- 60º, and 3rd- 100º
Sorry!
Great Job
Question #9
If two sides of a triangle are said to
be congruent that means that they
are different lengths. True or False.


True
False
Incorrect
Correct
Transversals of Parallel Lines
A transversal is a line that intersects any two or
more other lines.
 When a transversal intersects parallel lines the
angles formed have the following properties:
1. All acute angles formed are congruent.
2. All obtuse angles formed are congruent.
3. Any acute angle is supplementary to any
obtuse angle formed.

Question #10
What types of angles are 4 and 6?
•
Corresponding Angles
QuickTime™ and a
TIFF (Uncompressed) decompressor
are needed to see this picture.
Alternate Interior Angles
Alternate Exterior Angles
OOPS!
Excellent!
Question #11
What types of angles are 2 and 6?
•
The angles are alternate
interior.
•
The angles are corresponding.
•
The angles are vertical.
•
Not enough information.
QuickTime™ and a
TIFF (Uncompressed) decompressor
are needed to see this picture.
Wrong Answer
Correct
Question #12
What types of angles are 1 and 7?
•
Vertical Angles
•
Corresponding Angles
•
Alternate Exterior Angles
•
Alternate Interior Angles
QuickTime™ and a
TIFF (Uncompressed) decompressor
are needed to see this picture.
OOPS!
Great Job!
Slope
The slope of any line is:
Vertical Change
Horizontal Change
Which is the same as: Rise
Run
Question #13
What is the slope of the top line?
•
1
•
-1
2
-2
QuickTime™ and a
TIFF (Uncompressed) decompressor
are needed to see this picture.
Incorrect
Correct
Question #14
What is the slope of this line?

0

1

Not enough information.
OOPS!
Great Job
Question # 15
What is the slope of this line?

1

0

Undefined

-1

Not Enough Information
Sorry
Excellent
The End!