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Decide whether three lengths can make a triangle

7th grade (Year 8 in England) · 16 questions · Common Core: 7.G.A.2 · England: KS3 Geometry and measures, GCSE Foundation Geometry and measures

Name

Date

Score/ 16

  1. Question 1

    Two sides of a triangle are 11 cm and 11 cm. The third side is a whole number of cm. What is the smallest it can be?

    Answer

  2. Question 2

    Can sticks of length 4 cm, 2 cm and 3 cm make a triangle?

    • A. Yes
    • B. No

  3. Question 3

    Two sides of a triangle are 13 cm and 11 cm. The third side is a whole number of cm. What is the smallest it can be?

    Answer

  4. Question 4

    Can sticks of length 6 cm, 4 cm and 13 cm make a triangle?

    • A. Yes
    • B. No

  5. Question 5

    Two sides of a triangle are 12 cm and 5 cm. The third side is a whole number of cm. What is the greatest it can be?

    Answer

  6. Question 6

    Can sticks of length 6 cm, 4 cm and 12 cm make a triangle?

    • A. Yes
    • B. No

  7. Question 7

    Two sides of a triangle are 11 cm and 14 cm. The third side is a whole number of cm. What is the smallest it can be?

    Answer

  8. Question 8

    Can sticks of length 8 cm, 3 cm and 15 cm make a triangle?

    • A. Yes
    • B. No

  9. Question 9

    Two sides of a triangle are 11 cm and 7 cm. The third side is a whole number of cm. What is the smallest it can be?

    Answer

  10. Question 10

    Can sticks of length 5 cm, 6 cm and 6 cm make a triangle?

    • A. Yes
    • B. No

  11. Question 11

    Two sides of a triangle are 15 cm and 5 cm. The third side is a whole number of cm. What is the greatest it can be?

    Answer

  12. Question 12

    Can sticks of length 7 cm, 8 cm and 7 cm make a triangle?

    • A. Yes
    • B. No

  13. Question 13

    Two sides of a triangle are 9 cm and 11 cm. The third side is a whole number of cm. What is the greatest it can be?

    Answer

  14. Question 14

    Can sticks of length 8 cm, 2 cm and 9 cm make a triangle?

    • A. Yes
    • B. No

  15. Question 15

    Two sides of a triangle are 13 cm and 12 cm. The third side is a whole number of cm. What is the smallest it can be?

    Answer

  16. Question 16

    Can sticks of length 7 cm, 9 cm and 10 cm make a triangle?

    • A. Yes
    • B. No

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Answer key: Decide whether three lengths can make a triangle

  1. 1. 1

  2. 2. A. Yes

  3. 3. 3

  4. 4. B. No

  5. 5. 16

  6. 6. B. No

  7. 7. 4

  8. 8. B. No

  9. 9. 5

  10. 10. A. Yes

  11. 11. 19

  12. 12. A. Yes

  13. 13. 19

  14. 14. A. Yes

  15. 15. 2

  16. 16. A. Yes