Practice Pi (π) in Math
Use these practice problems to test your method after reviewing the concept explanation and worked examples.
Quick Recap
The ratio of a circle's circumference to its diameter, approximately 3.14159\ldots
No matter how big or small the circle, circumference \div diameter always equals \pi.
Example 1
easyA circle has a diameter of 10 cm. What is its circumference? Use \pi \approx 3.14.
Example 2
mediumA circle has a radius of 7 m. Find its area. Use \pi \approx 3.14.
Example 3
mediumA circular pool has a circumference of 31.4 m. Find its radius and area. Use \pi \approx 3.14.
Example 4
easyA circle's circumference is C = 62.8 cm. What is its diameter? Use \pi \approx 3.14.
Example 5
hardA wheel of radius 0.5 m rolls without slipping. How many full rotations does it make to travel 100 m? Use \pi \approx 3.14159.