Math 7 EDL Lesson 6: Circumference

What does "circumference" mean?

• Space a circle takes up
• Distance around a circle
• Line from one side of a circle to another
• Line from center of circle to side

Tags

CCSS.3.MD.D.8

What is the formula for circumference of a circle given the diameter?

• C = πr

• C = 2πr

• C = πd

• C = 2πd

What is the formula for circumference of a circle given the radius?

• C = πr

• C = 2πr

• C = πd

• C = π2d

Steven purchases a bowl. The diameter of the bowl is 14 cm. What is the circumference of the bowl? Use 3.14 as π.

• 28 cm

• 43.98 cm

• 87.96 cm

• 7 cm

Cynthia wants to buy a round photo frame for her brother. The radius of the photo frame is 9 cm. What is the photo frame’s circumference? Use 3.14 as π.

• 28.26 cm

• 56.52 cm

• 4.5 cm

• 18 cm

What is the circumference of this circle? Use 3.14 as π.

• 3.14 cm

• 37.7 cm

• 24 cm

• 68.4 cm

Find the circumference of a circle with a radius of 12.5 mm. Leave your answer in terms of π.

• 25π mm

• 12.5π mm

• 78.54mm

• none of the above

Find the circumference of a circle with a diameter of 11 millimeters. Leave your answer in terms of π.

• 34.6 mm

• 22π mm

• 5.5π mm

• 11π mm

Find the circumference (to the nearest whole number). Use 3.14 as π.

• 88 in

• 44 in

• 116 square in

• None of the above

The Jones family wants to enclose their circular garden with a fence. To the nearest foot, what is the minimum length of fencing they need to buy? Use 3.14 as π.

• 56.25 ft

• 246.2 ft

• 365.56 ft

• 392.5 ft