Shark Learning
Grade 6/Geometry

Circle Adventures

Solve word problems involving radius, diameter, and circumference.
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Easy
1
8 questions
2
8 questions
Medium
1
8 questions
2
8 questions
Hard
1
8 questions
2
8 questions

Practice Questions

  1. The diameter is 5 mm. Find the circumference. Use pi = 3.14.
    Show answer

    15.7 mm

  2. A circle has a radius of 17 in. What is its diameter?
    Show answer

    34 in

  3. A circle has a radius of 15 in. What is its diameter?
    Show answer

    30 in

  4. The radius is 9 cm. What is the diameter?
    Show answer

    18 cm

  5. A circle has a diameter of 18 m. What is its radius?
    Show answer

    9 m

Quick Tip
Radius is half the diameter. Diameter is twice the radius. Circumference is approx 3.14 × diameter.
Teacher Resources
Teaching Notes

This collection focuses on circle adventures. Use grid paper to help students visualize area and perimeter.

Vocabulary
Radius: Distance from center to edge of circle.
Diameter: Distance across circle through center.
Circumference: Distance around the circle's edge.
Common Mistakes
  • Confusing Area and Perimeter formulas
  • Forgetting to double the sides for Perimeter
  • Using wrong units (e.g., cm instead of sq cm for Area)
  • Confusing radius with diameter
  • Incorrectly calculating radius/diameter
  • Misinterpreting word problems
  • Forgetting units
Differentiation
SupportHave students trace shapes on grid paper and count squares.
ChallengeChallenge students to find multiple rectangles with the same area but different perimeters.
Discussion Questions
  • What is the difference between Area and Perimeter?
  • Can two rectangles have the same perimeter but different areas?
  • Why do we use 'square' units for area?
  • What defines a circle?
  • How are radius and diameter related?
  • Can you find the radius if you only know the diameter?
  • Where do we see circles in the real world?
Extension Activities
  • Measure the classroom floor area.
  • Design a garden with a specific perimeter.
  • Create art using only rectangles of specific areas.
Parent Tip

Help your child measure circular objects like plates or clocks.

Learning Path
Skill Cluster

Geometry and Measurement

Estimated Time

20 minutes

Skills Practiced
Circle adventures