line of symmetry
scalene
isosceles
acute-angled
congruent
right-angled
equilateral obtuse-angled
vertex
polygon
A triangle...
• is a closed figure (polygon)
• has three sides• has three
vertexes• has three interior
angles
vertexes
angle
side
Classifying Triangles
triangle
first name middle name last name
Which angle is the largest?
A
B
C
Which angle is the largest?
A
BC
Which angle is the largest?
B
A
C
obtuse-angled
acute-angled
right-angled
Possible Middle Names for Triangles
Classifying Triangles
acute-angledor
obtuse-angled or
right-angled
triangle
first name middle name last name
Equilateral Triangles
• 3 congruent sides• 3 congruent angles• 3 lines of symmetry
Isosceles Triangle
• 2 congruent sides• 2 congruent
angles• 1 line of
symmetry
Scalene Triangles
• 0 congruent sides• 0 congruent angles• 0 lines of symmetry
Classifying Triangles
equilateralor
isoscelesor
scalene
acute-angledor
obtuse-angled or
right-angled
triangle
first name middle name last name
Give the first, middle and last name for the following triangle:
first name middle name last name
isosceles
isosceles
Right-angledRight-angled
triangletriangle
Give the first, middle and last name for the following triangle:
first name middle name last name
triangletriangleobtuse-angled
obtuse-angled
isosceles
isosceles
Give the first, middle and last name for the following triangle:
first name middle name last name
triangletriangleacute-angledacute-angled
equilateral
equilateral
Give the first, middle and last name for the following triangle:
first name middle name last name
triangletriangleacute-angledacute-angled
scalenescalene
Give the first, middle and last name for the following triangle:
first name middle name last name
triangletriangleRight-angledRight-angled
scalenescalene
Recap: Classifying Triangles
equilateralor
isoscelesor
scalene
acute-angledor
obtuse-angled or
right-angled
triangle
first name middle name last name
Give the first, middle and last name for the following triangle:
first name middle name last name
What is the
measure of < A and
< B
A
B
Name The Angle
first name middle name last name
What is the measure of < A and < B
A
B 400
Name The Angle:
first name middle name last name
What is the
measure of < A and
< BA
300 B
Give the first, middle and last name for the following triangle:
first name middle name last name
What is the
measure of < A
A
300
Name The Angle
first name middle name last name
What is the
measure of < A , < B , and <
C
A
B C
What Can You Tell Me About These Figures?
What Can You Tell Me About This Figure?
What Can You Tell Me About This Figure?
What Can You Tell Me About This Figure?
What Can You Tell Me About This Figure?
What Can You Tell Me About This Figure?
Are These Figures Congruent?
Top Related