Geo 4.1: Classifying Triangles
Classify the triangle by its angle measure.
obtuse triangle
 right triangle
equlangular triangle
acute triangle
Classify the triangle by its angle measure.
obtuse triangle
equlangular triangle
86o
64o
 right triangle
acute triangle
Check all the characteristics that apply to this 
triangle. 
right triangle
acute triangle
obtuse triangle
equiangular triangle
90º
scalene triangle
isosceles triangle
equilateral triangle.
Classify the triangle by its side length and angle measure.
Scalene acute triangle
Obtuse right triangle
Isosceles right triangle
Scalene right triangle
Find the measure of ∡A.
m∡A = 
B
o
25o
C
127o
A
Find the measure of ∡A.
m∡A = 
B
25o
o
A
C
4.1
Find the measure of ∡A.
m∡A = 
A
º
B
C
Given ∆ABC, find the value of x andthe length of side AC.  
x = 
AC = 
A
2x + 7
4x - 3
B
3x - 5
C
Classify the triangle by its side length and angle measure.
Right Isosceles triangle
Isosceles triangle
45º
Right scalene triangle
right triangle
45º
Check all the characteristics that are true about thegiven triangle. (hint: there are 4)
acute triangle
obtuse triangle
right triangle
equiangular triangle
equilateral triangle
Isosceles triangle
scalene triangle
What is always true aboutangles ∡A and ∡B for the given right triangle.
a. They are acute.
b. They add to 90 degrees.
c. They are congruent.
d. Both a. and b. are correct.
A
B
C
Use the distance formula
to find AB, BC, and AC. 

Classify the triangle
by its side lengths. 
Scalene, because AC ≠ AB ≠ BC. 
Isosceles, because BC = AC. 
Isosceles, because AC = AB. 
Equilateral, because AC = AB = BC. 
Use the distance formula
to find AB, BC, and AC. 

Classify the triangle
by its side lengths. 
Scalene, because AC ≠ AB ≠ BC. 
Isosceles, because AC = AB. 
Isosceles, because BC = AB. 
Equilateral, because AC = AB = BC. 
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