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📐 Geometry

Perimeter of Triangle

Perimeter = sum of all sides

Formula

P = a + b + c

Perimeter = sum of all sides

Example

  • a = 5
  • b = 7
  • c = 8
  • P = 20
Result 20
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Grade 3 · Perimeter of Triangle

Easy 20 questions Worksheet #58329 For Perimeter of Triangle

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MathDigits Worksheet

Grade 3 · Perimeter of Triangle

Easy · 20 questions · Worksheet #58329 · Perimeter of Triangle

Name: ________________________

Date: ______________ Score: ______

  1. fill Find the perimeter of a triangle with sides 3 cm, 23 cm, and 3 cm. (P = a + b + c)
    ______________________________
  2. fill Find the perimeter of a triangle with sides 28 cm, 15 cm, and 11 cm. (P = a + b + c)
    ______________________________
  3. fill Find the perimeter of a triangle with sides 6 cm, 6 cm, and 24 cm. (P = a + b + c)
    ______________________________
  4. fill Find the perimeter of a triangle with sides 13 cm, 20 cm, and 15 cm. (P = a + b + c)
    ______________________________
  5. fill Find the perimeter of a triangle with sides 22 cm, 3 cm, and 18 cm. (P = a + b + c)
    ______________________________
  6. fill Find the perimeter of a triangle with sides 13 cm, 28 cm, and 18 cm. (P = a + b + c)
    ______________________________
  7. fill Find the perimeter of a triangle with sides 20 cm, 21 cm, and 13 cm. (P = a + b + c)
    ______________________________
  8. fill Find the perimeter of a triangle with sides 28 cm, 17 cm, and 24 cm. (P = a + b + c)
    ______________________________
  9. fill Find the perimeter of a triangle with sides 13 cm, 9 cm, and 24 cm. (P = a + b + c)
    ______________________________
  10. fill Find the perimeter of a triangle with sides 28 cm, 8 cm, and 5 cm. (P = a + b + c)
    ______________________________
  11. fill Find the perimeter of a triangle with sides 4 cm, 30 cm, and 20 cm. (P = a + b + c)
    ______________________________
  12. fill Find the perimeter of a triangle with sides 14 cm, 28 cm, and 21 cm. (P = a + b + c)
    ______________________________
  13. fill Find the perimeter of a triangle with sides 15 cm, 21 cm, and 14 cm. (P = a + b + c)
    ______________________________
  14. fill Find the perimeter of a triangle with sides 16 cm, 9 cm, and 21 cm. (P = a + b + c)
    ______________________________
  15. fill Find the perimeter of a triangle with sides 8 cm, 12 cm, and 23 cm. (P = a + b + c)
    ______________________________
  16. fill Find the perimeter of a triangle with sides 27 cm, 27 cm, and 28 cm. (P = a + b + c)
    ______________________________
  17. fill Find the perimeter of a triangle with sides 4 cm, 28 cm, and 14 cm. (P = a + b + c)
    ______________________________
  18. fill Find the perimeter of a triangle with sides 25 cm, 14 cm, and 20 cm. (P = a + b + c)
    ______________________________
  19. fill Find the perimeter of a triangle with sides 21 cm, 19 cm, and 17 cm. (P = a + b + c)
    ______________________________
  20. fill Find the perimeter of a triangle with sides 5 cm, 5 cm, and 15 cm. (P = a + b + c)
    ______________________________

Updated July 2026

FAQs

What is Perimeter of Triangle?

Perimeter of Triangle (perimeter triangle) is a geometry relationship written as Perimeter = sum of all sides or P = a + b + c. Students use it to solve unknowns when enough values are known.

How do you calculate Perimeter of Triangle step by step?

Write Perimeter = sum of all sides, substitute the known numbers carefully, then simplify. Worked walkthrough: a = 5 b = 7 c = 8 P = 20.

When is Perimeter of Triangle taught in school?

Perimeter of Triangle usually appears in geometry units during middle or secondary school. Match difficulty with MathDigits grade worksheets so practice fits the curriculum year.

What is a real example of Perimeter of Triangle?

On this page the worked result is 20. Generate a formula worksheet below for more unique practice sets.

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