Lesson 1 Classifying Triangles Worksheet Page 4
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9An equilateral triangle is also a special isosceles triangle. It has at least two
congruent sides.
Triangles
Scalene
Isosceles
Equilateral
Use both the angle and side names when classifying a triangle. The chart below
shows an example of each type of triangle when it is classified by its sides and
angles.
Scalene
Isosceles
Equilateral
60°
40°
60°
8
8
7
11
7
7
Acute
70°
70°
80°
40°
60°
60°
5
10
7
equilateral triangle
acute isosceles triangle
acute scalene triangle
45°
5.7
4
53°
3
5
Right
Not possible
37°
45°
4
4
right isosceles triangle
right scalene triangle
6
6
12
110°
60°
35°
35°
Obtuse
4
100°
20°
Not possible
10
11
obtuse scalene triangle
obtuse isosceles triangle
4
Classifying Triangles
C3 Lesson 1
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