Classifying Triangles Worksheet

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Classifying Triangles Worksheet

Name:Date:Class:

1.A triangle has sides

13

,

7

, and

15

. Classify it as equilateral, isosceles, or scalene.

2.A triangle has sides

4

,

4

, and

2

. Classify it as equilateral, isosceles, or scalene.

3.A triangle has sides

11

,

15

, and

14

. Classify it as equilateral, isosceles, or scalene.

4.A triangle has sides

9

,

9

, and

9

. Classify it as equilateral, isosceles, or scalene.

5.A triangle has sides

4

,

4

, and

5

. Classify it as equilateral, isosceles, or scalene.

6.A triangle has sides

3

,

5

, and

3

. Classify it as equilateral, isosceles, or scalene.

7.A triangle has sides

5

,

5

, and

5

. Classify it as equilateral, isosceles, or scalene.

8.A triangle has sides

9

,

13

, and

9

. Classify it as equilateral, isosceles, or scalene.

9.A triangle has sides

7

,

7

, and

7

. Classify it as equilateral, isosceles, or scalene.

10.A triangle has sides

14

,

14

, and

15

. Classify it as equilateral, isosceles, or scalene.

11.A triangle has sides

1

,

3

, and

3

. Classify it as equilateral, isosceles, or scalene.

12.A triangle has sides

15

,

12

, and

5

. Classify it as equilateral, isosceles, or scalene.

13.A triangle has sides

10

,

15

, and

12

. Classify it as equilateral, isosceles, or scalene.

14.A triangle has sides

7

,

7

, and

7

. Classify it as equilateral, isosceles, or scalene.

15.A triangle has sides

12

,

12

, and

12

. Classify it as equilateral, isosceles, or scalene.

16.A triangle has sides

4

,

3

, and

3

. Classify it as equilateral, isosceles, or scalene.

17.A triangle has sides

11

,

15

, and

8

. Classify it as equilateral, isosceles, or scalene.

18.A triangle has sides

12

,

3

, and

10

. Classify it as equilateral, isosceles, or scalene.

19.A triangle has sides

15

,

14

, and

4

. Classify it as equilateral, isosceles, or scalene.

20.A triangle has sides

5

,

8

, and

10

. Classify it as equilateral, isosceles, or scalene.

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Answer Key

Classifying Triangles Worksheet

1.A triangle has sides

13

,

7

, and

15

. Classify it as equilateral, isosceles, or scalene.scalene

2.A triangle has sides

4

,

4

, and

2

. Classify it as equilateral, isosceles, or scalene.isosceles

3.A triangle has sides

11

,

15

, and

14

. Classify it as equilateral, isosceles, or scalene.scalene

4.A triangle has sides

9

,

9

, and

9

. Classify it as equilateral, isosceles, or scalene.equilateral

5.A triangle has sides

4

,

4

, and

5

. Classify it as equilateral, isosceles, or scalene.isosceles

6.A triangle has sides

3

,

5

, and

3

. Classify it as equilateral, isosceles, or scalene.isosceles

7.A triangle has sides

5

,

5

, and

5

. Classify it as equilateral, isosceles, or scalene.equilateral

8.A triangle has sides

9

,

13

, and

9

. Classify it as equilateral, isosceles, or scalene.isosceles

9.A triangle has sides

7

,

7

, and

7

. Classify it as equilateral, isosceles, or scalene.equilateral

10.A triangle has sides

14

,

14

, and

15

. Classify it as equilateral, isosceles, or scalene.isosceles

11.A triangle has sides

1

,

3

, and

3

. Classify it as equilateral, isosceles, or scalene.isosceles

12.A triangle has sides

15

,

12

, and

5

. Classify it as equilateral, isosceles, or scalene.scalene

13.A triangle has sides

10

,

15

, and

12

. Classify it as equilateral, isosceles, or scalene.scalene

14.A triangle has sides

7

,

7

, and

7

. Classify it as equilateral, isosceles, or scalene.equilateral

15.A triangle has sides

12

,

12

, and

12

. Classify it as equilateral, isosceles, or scalene.equilateral

16.A triangle has sides

4

,

3

, and

3

. Classify it as equilateral, isosceles, or scalene.isosceles

17.A triangle has sides

11

,

15

, and

8

. Classify it as equilateral, isosceles, or scalene.scalene

18.A triangle has sides

12

,

3

, and

10

. Classify it as equilateral, isosceles, or scalene.scalene

19.A triangle has sides

15

,

14

, and

4

. Classify it as equilateral, isosceles, or scalene.scalene

20.A triangle has sides

5

,

8

, and

10

. Classify it as equilateral, isosceles, or scalene.scalene

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Worked Example

Problem: Sides: 7, 7, 10 cm. Angles: 69°, 69°, 42°. Classify.

Two equal sides (7, 7) → isosceles.— Exactly two sides are equal.
All angles < 90° → acute.— 69°, 69°, 42° are all less than 90°.

Answer: Isosceles acute triangle

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