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⭕ Circles

Diameter & Radius

Diameter = 2 × radius

Grade 9 · Diameter & Radius

Easy 20 questions Worksheet #13072 For Diameter & Radius

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MathDigits Worksheet

Grade 9 · Diameter & Radius

Easy · 20 questions · Worksheet #13072 · Diameter & Radius

Name: ________________________

Date: ______________ Score: ______

  1. fill If diameter d = 142, find the radius. (r = d/2)
    ______________________________
  2. fill If radius r = 200, find the diameter. (d = 2r)
    ______________________________
  3. fill If radius r = 44, find the diameter. (d = 2r)
    ______________________________
  4. fill If diameter d = 120, find the radius. (r = d/2)
    ______________________________
  5. fill If diameter d = 84, find the radius. (r = d/2)
    ______________________________
  6. fill If radius r = 18, find the diameter. (d = 2r)
    ______________________________
  7. fill If diameter d = 130, find the radius. (r = d/2)
    ______________________________
  8. fill If diameter d = 388, find the radius. (r = d/2)
    ______________________________
  9. fill If radius r = 50, find the diameter. (d = 2r)
    ______________________________
  10. fill If radius r = 105, find the diameter. (d = 2r)
    ______________________________
  11. fill If diameter d = 80, find the radius. (r = d/2)
    ______________________________
  12. fill If radius r = 170, find the diameter. (d = 2r)
    ______________________________
  13. fill If diameter d = 194, find the radius. (r = d/2)
    ______________________________
  14. fill If radius r = 81, find the diameter. (d = 2r)
    ______________________________
  15. fill If diameter d = 106, find the radius. (r = d/2)
    ______________________________
  16. fill If radius r = 139, find the diameter. (d = 2r)
    ______________________________
  17. fill If diameter d = 12, find the radius. (r = d/2)
    ______________________________
  18. fill If radius r = 120, find the diameter. (d = 2r)
    ______________________________
  19. fill If radius r = 173, find the diameter. (d = 2r)
    ______________________________
  20. fill If diameter d = 240, find the radius. (r = d/2)
    ______________________________

Updated July 2026

FAQs

What is Diameter & Radius?

Diameter & Radius (diameter radius) is a circles relationship written as Diameter = 2 × radius or d = 2r. Students use it to solve unknowns when enough values are known.

How do you calculate Diameter & Radius step by step?

Write Diameter = 2 × radius, substitute the known numbers carefully, then simplify. Worked walkthrough: r = 7 d = 14.

When is Diameter & Radius taught in school?

Diameter & Radius usually appears in circles units during middle or secondary school. Match difficulty with MathDigits grade worksheets so practice fits the curriculum year.

What is a real example of Diameter & Radius?

On this page the worked result is d = 14. Generate a formula worksheet below for more unique practice sets.

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