Radius, Diameter, and Circumference WS 6.6C: Describe the relationship between radius, diameter, and Name___________________________ circumference of a circle Date____________________________ Period___________________________ 1. Find the radius of a circle with a diameter of 4. Using the same figure from question #3, Find 36 centimeters. the circumference of the circle in units. Record your answer Record your answer and fill in the and fill in the bubbles bubbles using the using the correct correct place value. place value. _____2. A pizza pan has a circumference of _____5. The diameter of the circular top of a about 47 inches. Which expression can tuna can is 3.5 inches. Which of the be used to find the approximate radius following expressions can be used to of the pizza pan? determine the circumference of the top A. 47 ÷ 2 of the tuna can in inches. B. 47(2) C. 47 ÷ 2 A. 7 x C. 3.5 ÷ 2 x D. 47 ÷ B. 3.5 ÷ D. 3.5 x _____3. In the figure below, C is the center of _____6. The picture below shows 2 circles that the circle. share the same center point. Which statement is NOT true? Which equation can be used to find C, the A. Segment RT is a diameter of the approximate circumference of the outer circle in circle. centimeters? B. Segment SC is a radius of the A. C = 2(2+3) circle. B. C = (3)(2)() C. The length of the radius is 1.5 C. C = ()(2 + 3) units. D. C = 3 D. The length of the diameter is 4 units. _____7. In the figure below, C is the center of the circle. Which statement is true? _____10. The figure below shows two circles. The smaller circle has a radius, BC, of 5 cm. Point E is the center of the larger circle. What information is needed to find the length of segment BF? A. The length of the radius is 2 units. B. The circumference is about 15 units. C. The length of segment AD is about one- third the circumference of the circle. D. The length of segment BF is about one-half the circumference of the A. The circumference of the smaller circle. circle. B. The diameter of the smaller circle. C. The length of segment CD. D. The length of segment DE. 8. Find the circumference of the circle in 11. The rim of Mikayla’s cereal bowl has a question #7. circumference of 18 inches. What is the radius of the bowl? ___________________ __________________ 9. The diameter of a circle is 4 meters. What is 12. Using question #9 to the left, what is the the radius in centimeters? circumference of the circle? ___________________ ___________________ .