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Grades 6, 7 and 8 - Math - Middle School - Shapes - Circles
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In any circle the ratio of the distance around the curved perimeter to the distance across the circle through the center is the Greek letter π (pi) and has a value of just over 3.

Grades 6, 7 and 8 - Math - Middle School - Shapes - Circles
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10 Questions

1. A circular lawn has a 20 m radius. What is the approximate circumference of the lawn?
2. The area of a circular lawn is 628 m2. How far is it across to the nearest meter?
3. What can be calculated using π r2?
4. What is the correct formula for the circumference of a circle?
5. To the nearest square meter, what is the area of a circular pool with a radius of 10 m?
6. A line which joins the center of a circle to a point on the circumference is called a .......
7. What is the area of a circle with a radius of 7 cm (to one decimal place)?
8. A line which passes through the center of a circle and joins two points on its circumference is called a .......
9. A round table has a diameter of 200 cm. What is the approximate circumference of the table?
10. The distance measured around a circle is called the .......