How do you find the circumference of a

In this lesson you will learn to find the circumference of a circle by

Let’s Review The Constant of Proportionality (Unit Rate) Number of Books Price 2 $6

Let’s Review Diameter is the distance across a circle through the center. Radius is

Core. Review Lesson Let’s Springfield Middle School built a track in the shape of

Core. Review Lesson Let’s A C = 25. 12 inches B C = 15.

Core. Review Lesson Let’s Pi, represented by the symbol π, is a constant ratio

A Common Let’s Review Mistake When using the radius to find the circumference, remember

Core. Review Lesson Let’s What is the circumference of a circle that has a

In this lesson you have learned to find the circumference of a circle by

Guided Practice Let’s Review A circle has a radius of 6 inches. What is

Extension Let’s Review. Activities Alison stated “The circumference of a circle is approximately 6

Quick Quiz Let’s Review A circle has a diameter of 8 meters. What is

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How do you find the circumference of a circle? For Example A circle has a radius of 8 centimeters. What is the circumference of the circle?

In this lesson you will learn to find the circumference of a circle by exploring the ratio of the diameter and circumference.

Let’s Review The Constant of Proportionality (Unit Rate) Number of Books Price 2 $6 4 $12 5 $15 Constant of Proportionality = 3

Let’s Review Diameter is the distance across a circle through the center. Radius is the distance from the center of the circle to the edge of the circle. d = 2 r r=

Core. Review Lesson Let’s Springfield Middle School built a track in the shape of a circle. The diameter of the track is 100 meters. What is the circumference of the track? Circumference is the perimeter, or distance around, a circle.

Core. Review Lesson Let’s A C = 25. 12 inches B C = 15. 7 inches d = 5 inches d = 8 inches Constant of Proportionality = 3. 14

Core. Review Lesson Let’s Pi, represented by the symbol π, is a constant ratio that relates circumference and diameter. Pi is approximated as 3. 14 15. 7 = 5 x 3. 14 25. 12 =8 x 3. 14 C =πd or C = 2πr

A Common Let’s Review Mistake When using the radius to find the circumference, remember to multiply it by 2 to get the diameter. Wrong C = πr Correct C = 2πr

Core. Review Lesson Let’s What is the circumference of a circle that has a radius of 8 centimeters? Do not approximate pi. C = 2πr C = (2)π(8 cm) C = 16π cm

In this lesson you have learned to find the circumference of a circle by exploring the ratio of the diameter and circumference.

Guided Practice Let’s Review A circle has a radius of 6 inches. What is the circumference of the circle? Do not approximate pi.

Extension Let’s Review. Activities

Extension Let’s Review. Activities Alison stated “The circumference of a circle is approximately 6 times the radius of the circle. ” Is Alison’s statement correct? Explain your reasoning.

Quick Quiz Let’s Review A circle has a diameter of 8 meters. What is the circumference of the circle? Use 3. 14 for pi. A circle has a radius of 7 feet. Find the circumference of the circle. Do not approximate pi.

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