Classify Triangles by Angles & Sides
Directions:  If a triangle can be formed from the information about three of its parts,  select the best side classification and the best angle classification from the lists.
 If a triangle cannot be formed, select "a triangle cannot be formed."
Classifying Triangles
45 cm, 60 cm, 61 cm
Select the best classification(s) for the triangle. 
equilateral
isosceles
scalene
a triangle cannot be formed
obtuse
right
acute
Select the best classification(s) for the triangle. 
equilateral
isosceles
scalene
4 cm, 5 ft, 4 cm
a triangle cannot be formed
obtuse
right
acute
Select the best classification(s) for the triangle. 
equilateral
isosceles
scalene
a triangle cannot be formed
60ο, 60ο,60ο
obtuse
right
acute
41 m, 30 m, 20 m
Select the best classification(s) for the triangle. 
equilateral
isosceles
scalene
a triangle cannot be formed
obtuse
right
acute
Select the best classification(s) for the triangle. 
equilateral
isosceles
scalene
a triangle cannot be formed
9 in, 5 in, 3in
obtuse
right
acute
Select the best classification(s) for the triangle. 
13 cm, 1.7 cm, 17 mm
equilateral
isosceles
scalene
a triangle cannot be formed
obtuse
right
acute
Select the best classification(s) for the triangle. 
equilateral
isosceles
scalene
a triangle cannot be formed
81ο, 49ο,50ο
obtuse
right
acute
Select the best classification(s) for the triangle. 
equilateral
isosceles
scalene
a triangle cannot be formed
46ο, 46ο,44ο
obtuse
right
acute
Select the best classification(s) for the triangle. 
equilateral
isosceles
scalene
a triangle cannot be formed
3 ft, 6 ft, 9 ft
obtuse
right
acute
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