benjamin.nelson
benjamin.nelson 10h ago โ€ข 0 views

10 Real-World Circumference Examples with Solved Solutions (Grade 7)

Hey there! ๐Ÿ‘‹ Need help understanding circumference? It's all about measuring around circles! This guide will give you a quick overview and then test your knowledge with some fun questions. Let's get started! ๐Ÿค“
๐Ÿงฎ Mathematics

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๐Ÿ“š Quick Study Guide

  • ๐Ÿ“ Definition: Circumference is the distance around a circle.
  • โž— Diameter: The distance across a circle through the center.
  • ๐Ÿ”ด Radius: The distance from the center of a circle to any point on its edge (half the diameter).
  • ๐Ÿงฎ Formula 1 (using diameter): $C = \pi d$, where $C$ is the circumference, $\pi$ (pi) is approximately 3.14159, and $d$ is the diameter.
  • ๐Ÿ“ Formula 2 (using radius): $C = 2\pi r$, where $C$ is the circumference, $\pi$ (pi) is approximately 3.14159, and $r$ is the radius.
  • ๐Ÿ’ก Key Tip: Remember to use the correct units (e.g., cm, m, inches) in your answer!

Practice Quiz

  1. What is the circumference of a circular pizza with a diameter of 12 inches?
    1. 37.68 inches
    2. 18.84 inches
    3. 75.36 inches
    4. 6.28 inches
  2. A bicycle wheel has a radius of 30 cm. How far does the bicycle travel in one revolution of the wheel?
    1. 94.2 cm
    2. 188.4 cm
    3. 47.1 cm
    4. 60 cm
  3. A circular garden has a diameter of 8 meters. What is the length of fencing needed to enclose the garden?
    1. 50.24 meters
    2. 25.12 meters
    3. 12.56 meters
    4. 16 meters
  4. A round table has a radius of 2.5 feet. What is the circumference of the table?
    1. 7.85 feet
    2. 15.7 feet
    3. 19.625 feet
    4. 31.4 feet
  5. The circumference of a circular swimming pool is 50 meters. What is the diameter of the pool?
    1. 15.92 meters
    2. 7.96 meters
    3. 25 meters
    4. 314 meters
  6. A circular clock has a radius of 10 cm. What is the distance around the edge of the clock?
    1. 62.8 cm
    2. 31.4 cm
    3. 20 cm
    4. 100 cm
  7. A coin has a diameter of 2.5 cm. What is its circumference?
    1. 3.925 cm
    2. 7.85 cm
    3. 15.7 cm
    4. 1.25 cm
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